The title of the episode is a play on the 2011 film (and its sequel) The Best Exotic Marigold Hotel, about a group of retirees who purchase a hotel in India. Nanites are of course microsopic nanotechnological robots which were first introduced into the Star Trek universe in the TNG episode "Evolution", although chronologically they have existed as far back as DIS: "Perpetual Infinity".

The Stardate is 59393.7. Cerritos is at the Cosmic Duchess, an interstellar cruise ship with multiple domed biomes which is undergoing a nanite cluster infestation. Boimler's facial hair is increasing, now with stubble on his chin and cheeks. He notes that one of the casinos has Dixon Hill slot machines, Dixon Hill being a 20th-Century hard boiled detective character Picard was a fan of (TNG: "The Big Goodbye"). Mariner's shocked reaction to Jennifer's kiss is understandable, since we were led to understand they broke up in LD: "Trusted Sources".

Jet Manhaver is a background character who was last featured in LD: "We'll Always Have Tom Paris". The way he describes Ransom's using him as fodder is reminiscent of the jokes about the fates of redshirts in TOS.

T'Lyn suggests Jennifer has a brain parasite. The last time a brain parasite caused amorous complications was in LD: "Cupid's Errant Arrow". Jennifer says she is being transferred to the USS Manitoba, which from the name might be a Parliament-class starship (the others we know of being Toronto and Vancouver).

The Risa Bar is named of course after the pleasure planet (TNG: “Captain’s Holiday”) and the biome actually reminds me of the Risa instance in Star Trek Online. This is the first time we’ve actually seen Gallamites although the species was first mentioned in DS9: “The Maquis, Part I” when Jadzia Dax mentioned she had a dinner date with the Gallamite Captain Boday, and Kira evinced some discomfort with his transparent skull. Kreetassans, an easily offended species, first appeared in ENT: “Vox Sola” and consider eating a taboo activity not to be done in front of others. The huge dangerous mountain pointed out by Ransom vaguely resembles the Paramount logo if you squint (it may just be a coincidence).

T’Lyn makes note of the poster of Krog on the Rocks, who performs on Vibe Tubes. Named in this episode, the Vibe Tubes are a futuristic musical instrument, the prop first seen being played in a holographic recreation in TNG: "We'll Always Have Paris".

Admiral Milius’s acolyte is Denobulan, the same species as Dr Phlox of ENT. Denobulan females emit powerful pheremones during mating (ENT: “Dear Doctor”). “Not everyone keeps their genitals in the same place,” is a lesson we first learned in ST VI.

Tendi makes reference to Mariner's parents, who are often separated for long periods of time since Carol Freeman is a starship Captain and Alonzo is a Starfleet Admiral.

Milius' appearance resembles that of Marlon Brando's Colonel Kurtz in the 1979 movie Apocalypse Now, which in turn was written by John Milius, Francis Coppola and Michael Herr inspired by Joseph Conrad's novella Heart of Darkness. In both stories the Kurtz character sets himself up as a demigod worshipped by natives.

An iscosahedron is a 20-sided polyhedron, best known to tabletop roleplayers as a d20 die. Gormaganders (DIS: "Magic to Make the Sanest Man Go Mad") and the "Galaxy's Child" thing (TNG: "Galaxy's Child"), are examples of cosmozoans, giant organisms that live in space.

Captain Tersal says that her parallel universe Endeavor has been through a "month of hell", an allusion to VOY: "Year of Hell". Although Endeavor's scale is due to her being from a universe that is tiny, in the Prime universe Defiant was once shrunk by a subspace anomaly (DS9: "One Little Ship") and Voyager was turned into a Christmas tree ornament by Q (VOY: "Death Wish").

The title of the episode is a play on the 2011 film (and its sequel) The Best Exotic Marigold Hotel, about a group of retirees who purchase a hotel in India. Nanites are of course microsopic nanotechnological robots which were first introduced into the Star Trek universe in the TNG episode "Evolution", although chronologically they have existed as far back as DIS: "Perpetual Infinity".

The Stardate is 59393.7. Cerritos is at the Cosmic Duchess, an interstellar cruise ship with multiple domed biomes which is undergoing a nanite cluster infestation. Boimler's facial hair is increasing, now with stubble on his chin and cheeks. He notes that one of the casinos has Dixon Hill slot machines, Dixon Hill being a 20th-Century hard boiled detective character Picard was a fan of (TNG: "The Big Goodbye"). Mariner's shocked reaction to Jennifer's kiss is understandable, since we were led to understand they broke up in LD: "Trusted Sources".

Jet Manhaver is a background character who was last featured in LD: "We'll Always Have Tom Paris". The way he describes Ransom's using him as fodder is reminiscent of the jokes about the fates of redshirts in TOS.

T'Lyn suggests Jennifer has a brain parasite. The last time a brain parasite caused amorous complications was in LD: "Cupid's Errant Arrow". Jennifer says she is being transferred to the USS Manitoba, which from the name might be a Parliament-class starship (the others we know of being Toronto and Vancouver).

The Risa Bar is named of course after the pleasure planet (TNG: “Captain’s Holiday”) and the biome actually reminds me of the Risa instance in Star Trek Online. This is the first time we’ve actually seen Gallamites although the species was first mentioned in DS9: “The Maquis, Part I” when Jadzia Dax mentioned she had a dinner date with the Gallamite Captain Boday, and Kira evinced some discomfort with his transparent skull. Kreetassans, an easily offended species, first appeared in ENT: “Vox Sola” and consider eating a taboo activity not to be done in front of others. The huge dangerous mountain pointed out by Ransom vaguely resembles the Paramount logo if you squint (it may just be a coincidence).

T’Lyn makes note of the poster of Krog on the Rocks, who performs on Vibe Tubes. Named in this episode, the Vibe Tubes are a futuristic musical instrument, the prop first seen being played in a holographic recreation in TNG: "We'll Always Have Paris".

Admiral Milius’s acolyte is Denobulan, the same species as Dr Phlox of ENT. Denobulan females emit powerful pheremones during mating (ENT: “Dear Doctor”). “Not everyone keeps their genitals in the same place,” is a lesson we first learned in ST VI.

Tendi makes reference to Mariner's parents, who are often separated for long periods of time since Carol Freeman is a starship Captain and Alonzo is a Starfleet Admiral.

Milius' appearance resembles that of Marlon Brando's Colonel Kurtz in the 1979 movie Apocalypse Now, which in turn was written by John Milius, Francis Coppola and Michael Herr inspired by Joseph Conrad's novella Heart of Darkness. In both stories the Kurtz character sets himself up as a demigod worshipped by natives.

An iscosahedron is a 20-sided polyhedron, best known to tabletop roleplayers as a d20 die. Gormaganders (DIS: "Magic to Make the Sanest Man Go Mad") and the "Galaxy's Child" thing (TNG: "Galaxy's Child"), are examples of cosmozoans, giant organisms that live in space.

Captain Tersal says that her parallel universe Endeavor has been through a "month of hell", an allusion to VOY: "Year of Hell". Although Endeavor's scale is due to her being from a universe that is tiny, in the Prime universe Defiant was once shrunk by a subspace anomaly (DS9: "One Little Ship") and Voyager was turned into a Christmas tree ornament by Q (VOY: "Death Wish").

The title is similar to the infamous Season 2 clip show TNG: “Shades of Grey”, written due to a writer’s strike at the time.

D’Erika is eating wing-slug rolls. Orion wing-slugs were mentioned by Lwaxana Troi in TNG: “Ménage à TroiBoimler has seen when he died briefly (LD: “In the Cradle of Vexilonn beta canon they are said to be native to the Rigel system.

The Stardate is 59376.9 - by TNG reckoning that makes it 2382 (as also reckoned using Naomi Wildman’s age last episode), and Cerritos is at Targalus IX. One of the banners being displayed says “No Money No Problems”, an allusion to the song “Mo Money Mo Problems” by the Notorious B.I.G.

Boimler appears to trying to grow facial hair, probably inspired by his parallel counterpart from last episode. He’s calling his tips “Bointers”. He is addressed as Commander even though his rank remains LT-jg, presumably because he’s in command of this away team.

The shuttle Sequoia, named after the California National Park like all Cerritos shuttles, was damaged in LD: “No Small Parts” and has been under repair since LD: “Strange Energies”.

The Blue Orions are House Azure now, and a blazzard is a kind of domesticated Orion bird with reptilian features. Tendi says Orions haven’t used sailships in hundreds of years. Bajoran lightships used solar sails as far back as the 16th Century (DS9: “Explorers”), and R’ongovian ships also used solar sails for ceremonial purposes (SNW: “Spock Amok”).

The Orion sailship doesn’t have inertial dampeners, and neither did the Bajoran lightship. Inertial dampeners are only critical at FTL speeds, and solar sails are not meant for that. However, like Sisko’s Bajoran lightship, the Orion sailship does appear to have gravity plating.

Sarium krellide is a material used in power cells or in explosives (TNG: “In Theory”), and also powered Starfleet combadges (PRO: “Observer’s Paradox”).

Phlox kept a Pyrithian Bat as part of his menagerie on the NX-01 (ENT: “Flight or Fight”, et al.).

“It is possible to do everything right and still get your away team kidnapped by the corporate elite,” is a paraphrase of Picard’s “It is possible to commit no mistakes and still lose,” from TNG: “Peak Performance”.

On Hysperia, they keep dragons for pets and call their warp drives “dragonsbreath engines” (LD: “Where Pleasant Fountains Lie”).

T’Lyn appears to have added herself to the cartoon squiggles of the others on the Sequoia’s hatch.

Boimler tells Mackler to “turn away from the mountain”. The Black Mountain is a spiritual battleground in the afterlife (LD: “We’ll Always Have Tom Paris”) which Boimler has seen when he died briefly (LD: “In the Cradle of Vexilon”).

Assisting T'Lyn in demolishing Sequoia is Goodgey, Badgey's good twin from LD: "A Few Badgeys More".

The title is similar to the infamous Season 2 clip show TNG: “Shades of Grey”, written due to a writer’s strike at the time.

D’Erika is eating wing-slug rolls. Orion wing-slugs were mentioned by Lwaxana Troi in TNG: “Ménage à Trois”, and offered on a menu in the Shipyard Bar in Star Trek 2009. In beta canon they are said to be native to the Rigel system.

The Stardate is 59376.9 - by TNG reckoning that makes it 2382 (as also reckoned using Naomi Wildman’s age last episode), and Cerritos is at Targalus IX. One of the banners being displayed says “No Money No Problems”, an allusion to the song “Mo Money Mo Problems” by the Notorious B.I.G.

Boimler appears to trying to grow facial hair, probably inspired by his parallel counterpart from last episode. He’s calling his tips “Bointers”. He is addressed as Commander even though his rank remains LT-jg, presumably because he’s in command of this away team.

The shuttle Sequoia, named after the California National Park like all Cerritos shuttles, was damaged in LD: “No Small Parts” and has been under repair since LD: “Strange Energies”.

The Blue Orions are House Azure now, and a blazzard is a kind of domesticated Orion bird with reptilian features. Tendi says Orions haven’t used sailships in hundreds of years. Bajoran lightships used solar sails as far back as the 16th Century (DS9: “Explorers”), and R’ongovian ships also used solar sails for ceremonial purposes (SNW: “Spock Amok”).

The Orion sailship doesn’t have inertial dampeners, and neither did the Bajoran lightship. Inertial dampeners are only critical at FTL speeds, and solar sails are not meant for that. However, like Sisko’s Bajoran lightship, the Orion sailship does appear to have gravity plating.

Sarium krellide is a material used in power cells or in explosives (TNG: “In Theory”), and also powered Starfleet combadges (PRO: “Observer’s Paradox”).

Phlox kept a Pyrithian Bat as part of his menagerie on the NX-01 (ENT: “Flight or Fight”, et al.).

“It is possible to do everything right and still get your away team kidnapped by the corporate elite,” is a paraphrase of Picard’s “It is possible to commit no mistakes and still lose,” from TNG: “Peak Performance”.

On Hysperia, they keep dragons for pets and call their warp drives “dragonsbreath engines” (LD: “Where Pleasant Fountains Lie”).

T’Lyn appears to have added herself to the cartoon squiggles of the others on the Sequoia’s hatch.

Boimler tells Mackler to “turn away from the mountain”. The Black Mountain is a spiritual battleground in the afterlife (LD: “We’ll Always Have Tom Paris”) which Boimler has seen when he died briefly (LD: “In the Cradle of Vexilon”).

Assisting T'Lyn in demolishing Sequoia is Goodgey, Badgey's good twin from LD: "A Few Badgeys More".

The title is Spanish for “Two Little Hills”, and aside from a literal description of the episode’s plot, reminded me of the song “Dos Oruguitas” (Two Butterflies) from the movie Encanto. A similar title was LD: "wej Duj", Klingon for "Three Ships".

The collector’s (Yorif by the closed captioning) ship is a Zibalian freighter (TNG: “The Most Toys”), and the collector himself is of the same unnamed species as Palor Toff from that episode, which also appeared in LD: “Reflections”. He has Hupyrian guards (TNG: “The Nagus”, et al.). Tendi’s holographic disguise is that of a Heliian woman, the species to which Aquiel belonged (TNG: “Aquiel”).

Seen in the collection is a Risian horgh’an (TNG: “Captain’s Holiday”), a Veltan lust idol (called a sex idol in “The Most Toys”), next to a broken Bajoran Reckoning Tablet (DS9: “The Reckoning”). Apparently, Orions lived in childhood slime dungeons. Yorif uses a ST II design phaser and claims his ornate facial piercing is “prescription”.

The LD title has the 3D effect that was applied to TNG’s title which appeared only in Season 5. The ever-crowded battle in the title sequence is joined by Apollo’s hand (TOS: “Who Mourns for Adonais?”), which grabs the Borg cube, a Tholian ship drawing its web (TOS: “The Tholian Web”) and V’Ger (TMP), complete with its sound effects.

Mariner is playing a game of Vulcan kal-toh with T’Lyn. Boimler’s Fleet magazine, aside from the “30 Under 30” feature, also highlights “Klingon Kouture: Blood is the New Black” (an allusion to Orange is the New Black, which also starred Kate Mulgrew), as well as “Q Who? The Continuum Awaits”(alluding to TNG: “Q Who?”). It also mentions “Treknomics”, which is an out-of-universe term used to refer to Star Trek economics. The cover also somewhat resembles the official Star Trek Explorer magazine published by Titan Comics. It is issue No. 47, a recurring number and in-joke in Star Trek.

Naomi Wildman was born on Voyager in 2372 during its sojourn in the Delta Quadrant, the half-Ktarian half-human daughter of Ensign Samantha Wildman who was pregnant when she came on board. This dates this season around 2382. Tendi mentions it’s been “months” since the end of Season 4.

Worf encountered a quantum fissure in TNG: “Parallels”, which sent him on a journey through several parallel realities, including parallel Enterprises. D’Erika says that the Orion warship (later we find out it’s a medical frigate) dates from the time of the Great Plague over 300 years prior. Roger Korby’s claim to fame was his translation of medical records from Orion ruins that revolutionized immunization techniques (TOS: “What Are Little Girls Made Of?”), but I always imagined the ruins to be older than a few centuries.

It was established in “Parallels” that quantum signatures differ from universe to universe. In this case, the parallel that Cerritos is in exhibits only a .327% variance. Among the differences in hair (and in Otherford’s case, cybernetic augmentations), the parallel Billups is King (where our Billups rejected the throne) and has Hysperian accessories over his uniform, like Worf used to wear his sash over his.

We finally find out that Mariner is her middle name, so she was born Beckett Mariner Freeman. She went by "Becky" when living on Starbase 25 (LD: "An Embarassment of Dopplers") and her father still uses that name (LD: "Grounded").

The globes at the rear of the Orion frigate are like those spinning at the rear of a D’Var type Orion scout ship (TOS: “Journey to Babel”, SNW: “Those Old Scientists”). Blue-skinned Orions (actually light green) appeared only in TAS and were the result of coloring problems in the animation (Hal Sutherland, the director, was colorblind, also explaining why TAS tribbles are pink). Also, the odd pronunciation of “Orion” by the blue-skinned Orions here (“OR-ee-on”) comes from TAS: “The Pirates of Orion”, the mistake being due to an absence of a pronunciation guide.

Captain Becky says “there’s no interpersonal conflict allowed on my ship!” which was Roddenberry’s edict for TNG. Mariner also mentioned that people weren’t supposed to have conflict in LD: “Strange Energies”. Becky also uses a riding crop - in LD: “First First Contact” Mariner said she didn’t want a new captain because potentially they could be “some weirdo with a riding crop”. That was likely an allusion to Captain Styles (ST III) using a swagger stick.

As she goes to replace Mariner, Becky uses the sarcastic Vulcan salute first seen in LD: “Moist Vessel”. We find out that the parallel Captain Freeman ended up at the infamous Starbase 80 (first mentioned in LD: “Terminal Provocations”).

The Blue Orions say they are laughed at for their “ridiculous uniforms”, which were a product of TAS design. As Parallel Boimler goes to take his seat as Acting Captain, he does a reverse Riker Maneuver out of the conn chair.

At the bar next to Ransom is a bottle of Cardassian kanar (DS9: “The Marquis, Part II”). In front of Boimler is a raktajino mug seen in DS9, in reality a Highwave Hotjo 16 oz. Travel Mug.

The title is Spanish for “Two Little Hills”, and aside from a literal description of the episode’s plot, reminded me of the song “Dos Oruguitas” (Two Butterflies) from the movie Encanto. A similar title was LD: "wej Duj", Klingon for "Three Ships".

The collector’s (Yorif by the closed captioning) ship is a Zibalian freighter (TNG: “The Most Toys”), and the collector himself is of the same unnamed species as Palor Toff from that episode, which also appeared in LD: “Reflections”. He has Hupyrian guards (TNG: “The Nagus”, et al.). Tendi’s holographic disguise is that of a Heliian woman, the species to which Aquiel belonged (TNG: “Aquiel”).

Seen in the collection is a Risian horgh’an (TNG: “Captain’s Holiday”), a Veltan lust idol (called a sex idol in “The Most Toys”), next to a broken Bajoran Reckoning Tablet (DS9: “The Reckoning”). Apparently, Orions lived in childhood slime dungeons. Yorif uses a ST II design phaser and claims his ornate facial piercing is “prescription”.

The LD title has the 3D effect that was applied to TNG’s title which appeared only in Season 5. The ever-crowded battle in the title sequence is joined by Apollo’s hand (TOS: “Who Mourns for Adonais?”), which grabs the Borg cube, a Tholian ship drawing its web (TOS: “The Tholian Web”) and V’Ger (TMP), complete with its sound effects.

Mariner is playing a game of Vulcan kal-toh with T’Lyn. Boimler’s Fleet magazine, aside from the “30 Under 30” feature, also highlights “Klingon Kouture: Blood is the New Black” (an allusion to Orange is the New Black, which also starred Kate Mulgrew), as well as “Q Who? The Continuum Awaits”(alluding to TNG: “Q Who?”). It also mentions “Treknomics”, which is an out-of-universe term used to refer to Star Trek economics. The cover also somewhat resembles the official Star Trek Explorer magazine published by Titan Comics. It is issue No. 47, a recurring number and in-joke in Star Trek.

Naomi Wildman was born on Voyager in 2372 during its sojourn in the Delta Quadrant, the half-Ktarian half-human daughter of Ensign Samantha Wildman who was pregnant when she came on board. This dates this season around 2382. Tendi mentions it’s been “months” since the end of Season 4.

Worf encountered a quantum fissure in TNG: “Parallels”, which sent him on a journey through several parallel realities, including parallel Enterprises. D’Erika says that the Orion warship (later we find out it’s a medical frigate) dates from the time of the Great Plague over 300 years prior. Roger Korby’s claim to fame was his translation of medical records from Orion ruins that revolutionized immunization techniques (TOS: “What Are Little Girls Made Of?”), but I always imagined the ruins to be older than a few centuries.

It was established in “Parallels” that quantum signatures differ from universe to universe. In this case, the parallel that Cerritos is in exhibits only a .327% variance. Among the differences in hair (and in Otherford’s case, cybernetic augmentations), the parallel Billups is King (where our Billups rejected the throne) and has Hysperian accessories over his uniform, like Worf used to wear his sash over his.

We finally find out that Mariner is her middle name, so she was born Beckett Mariner Freeman. She went by "Becky" when living on Starbase 25 (LD: "An Embarassment of Dopplers") and her father still uses that name (LD: "Grounded").

The globes at the rear of the Orion frigate are like those spinning at the rear of a D’Var type Orion scout ship (TOS: “Journey to Babel”, SNW: “Those Old Scientists”). Blue-skinned Orions (actually light green) appeared only in TAS and were the result of coloring problems in the animation (Hal Sutherland, the director, was colorblind, also explaining why TAS tribbles are pink). Also, the odd pronunciation of “Orion” by the blue-skinned Orions here (“OR-ee-on”) comes from TAS: “The Pirates of Orion”, the mistake being due to an absence of a pronunciation guide.

Captain Becky says “there’s no interpersonal conflict allowed on my ship!” which was Roddenberry’s edict for TNG. Mariner also mentioned that people weren’t supposed to have conflict in LD: “Strange Energies”. Becky also uses a riding crop - in LD: “First First Contact” Mariner said she didn’t want a new captain because potentially they could be “some weirdo with a riding crop”. That was likely an allusion to Captain Styles (ST III) using a swagger stick.

As she goes to replace Mariner, Becky uses the sarcastic Vulcan salute first seen in LD: “Moist Vessel”. We find out that the parallel Captain Freeman ended up at the infamous Starbase 80 (first mentioned in LD: “Terminal Provocations”).

The Blue Orions say they are laughed at for their “ridiculous uniforms”, which were a product of TAS design. As Parallel Boimler goes to take his seat as Acting Captain, he does a reverse Riker Maneuver out of the conn chair.

At the bar next to Ransom is a bottle of Cardassian kanar (DS9: “The Marquis, Part II”). In front of Boimler is a raktajino mug seen in DS9, in reality a Highwave Hotjo 16 oz. Travel Mug.

The title was first used in the context of the Progenitors in TNG: “The Chase” when Picard remarked, “[The puzzle] is 4 billion years old. A computer program from a highly advanced civilisation, and it's hidden in the very fabric of life itself.“ In DIS: “Red Directive” the phrase was used in conjunction with saying the Progenitor technology was “used to design life itself.”

Burnham activates her holographic tricorder function from her tricom badge, first introduced in DIS: “Scavengers” as the 32nd Century combination tricorder, communicator and personal transporter. She also materializes a 32nd Century phaser pistol, which can be summoned at will thanks to it being composed of programmable matter.

Window-like gateways allowing instantaneous travel to other worlds was a hallmark of another ancient civilization, the Iconians (TNG: “Contagion”), who used them to control a vast empire which was destroyed over 200,000 years prior, although there were still survivors existing into the 32nd Century (DIS: “The Examples”). Their gateways also survived, with one being the focus of conflict in DS9: “To the Death”.

Tahal’s fleet will arrive in 60 minutes. Primarch Tahal is one of the five remaining Primarchs of the Bree Imperium, and in the past conquered Kellerun, Rayner’s planet. Rayner was the only survivor of his family.

Burnham has indeed seen the future - in DIS: “Face the Strange” she and Rayner were jumped 30 years ahead to see a lifeless Discovery and a Federation HQ devastated by the Breen thanks to them using Progenitor tech.

Rayner refers to the avalanche caused by Moll and L’ak on Q’Mau in order to facilitate their escape (DIS: “Red Directive”).

Culber gives Book a shot to counter radiation sickness. In TOS: “The Deadly Years”, the drug of choice to do that was hyronalin, was which also used during the TNG era in several episodes. Culber has had an existential crisis ever since he became host to the memories and personality of Jinaal on Trill (DIS: “Jinaal”).

Moll put L’ak in her personal pattern buffer in DIS: “Lagrange Point” to keep him safe.

Using plasma to take out multiple hostiles was a tactic used by Worf’s brother Kurn, who went to warp near the surface of a star, setting off a flare which destroyed his pursuers (TNG: “Redemption II”). In TNG: “Descent, Part II”, the Enterprise-D under Beverly Crusher’s command fired a particle beam into a star to make it erupt and destroy a Borg ship.

Culber tells Book to adjust the tractor beam to subspace resonance frequency 5.1732, then uses the classic “I’m a doctor, not a…” trope associated most with McCoy from TOS (my personal favorite is from TOS: “The Devil in the Dark”, where he complains about treating the silicon-based Horta with, “I’m a doctor, not a bricklayer!”).

Ferengi rummy is presumably a card game. Rummy is the name given to a group of Earth card games, with the most common variant being Gin Rummy. It is claimed that the name comes from using rum as betting stakes.

The Progenitor that greets Burnham is in an updated version of the original Progenitor makeup from TNG: “The Chase” (played then by Salome Jens, who went on to play the female Founder in DS9).

The Galactic Barrier is an energy field that surrounds the Milky Way, penetrated by the USS Enterprise in TOS: “Where No Man Has Gone Before” and then again in TOS: “By Any Other Name”. The Barrier also featured in DIS Season 4, with Species 10-C living beyond it in extragalactic space. The origins of the Barrier have never been explained on screen, although beta canon has offered some possibilities, one of which was the Progenitors (William Shatner and Judith and Garfield Reeves-Stevens’ Captain’s Glory).

The Progenitors were not the creators of the technology but think that it was made by their creators. So, basically, it’s Progenitors all the way down. And while they effectively could recreate a live body from a dead one, it would basically be a clone without any of the previous body’s memories or personality.

The Betazoid scientist Dr Marina Derex was one of those that discovered the Progenitor tech 800 years prior. Her clue was in the manuscript of her book, Labyrinths of the Mind (DIS: “Labyrinths”).

This is the first time Discovery has shown the ability to separate its saucer from its secondary hull. Saucer separation was mentioned as being possible in TOS behind the scenes documents but it was not until TNG: “Encounter at Farpoint” that separation (and rejoining) became a fact on screen.

“Infinite Diversity in Infinite Combinations” is a tenet of Vulcan philosophy, first mentioned in TOS: “Is There in Truth No Beauty?”, also known as IDIC. In-universe, it dates back to at least Surak’s time, c.300 CE (ENT: “The Forge”).

When Kovich tells her that all information regarding the Progenitor tech will be classified, Burnham quips she knows how those things work. When Discovery jumped to the 32nd Century at the end of Season 2 to prevent misuse of the Sphere Data, all knowledge of the spore drive was classified and scrubbed from 23rd century records, and even as far as the 32nd century was concerned the original Discovery was destroyed back then.

The device Burnham holds gives her access to the Infinity Room, a highly secure conference space, first seen in DIS: “Red Directive”.

Kovich cryptically says he’s “lived many years and many lives”. Given the scope of the Star Trek universe, this could very well be more than metaphorical. On the shelf behind him we see a bottle of Château Picard, Geordi LaForge’s VISOR and Benjamin Sisko’s baseball.

Agent Daniels first appeared in ENT: “Cold Front” as Crewman Daniels of the NX-01 Enterprise (which technically didn’t have a USS prefix until its refit). He was revealed to be a Time Agent, a temporal operative from the 31st Century fighting in the Temporal Cold War. He last appeared in ENT: “Storm Front, Part II”, informing Archer that due to his actions, the Temporal War was coming to an end.

Talaxians, of course, are Neelix’s race (VOY), last referenced in a reading list that included A Comprehensive Guide to Talaxian Hair Styles. The Eternal Archive also gave Book a cutting from the World Root, a tree system that extended across his now-destroyed planet Kwejian (DIS: “Labyrinths”). He planted it on Sanctuary Four, a planet used as a wildlife sanctuary for trance worms, one of which, nicknamed Molly was delivered there by Book in DIS: “That Hope is You, Part 1”.

The box on the table across from Admiral Burnham’s bed is the one made of Tulí wood, that contained the World Root cuttings, given to Book by the Eternal Archive. The color of the vegetation outside the window identifies the planet as Sanctuary Four.

Crepuscula was the very first planet we saw in the series, back in the first scene of DIS: “The Vulcan Hello”. Burnham and Philippa Georgiou performed a covert mission to restore the Crepusulans’ water supply, as the species was subject to General Order 1.

The age of Burnham’s son (and his Captain’s rank) implies that at least thirty-odd years have passed since Saru’s wedding.

Technically speaking, one “aye” means “I understand,” in response to information while “aye aye” means “I understand and will comply,” in response to an order.

Burnham’s shuttle bears the designation “UFP 47”, with 47 being a number which appears frequently in Star Trek, an in-joke started by TNG writer Joe Menosky, who was part of the 47 Society at California’s Pomona College. In the lake we see trance worms swimming. The warp streaks as the shuttle travels are consistent with what we saw of the pathway drive.

Burnham and Book’s son is named Leto, after Book’s nephew who died when Kwejian was destroyed (DIS: “Kobayashi Maru”).

The ending finally brings continuity in line with ST: “Calypso”, where Craft came across a deserted Discovery, empty save for Zora, adrift for a thousand years in deep space. For the longest time we were wondering how it would work since the starship was shown without its “A” suffix, which she obtained when refitted in the 32nd Century to hide her origins in the 23rd Century. The removal of the “A” by DOTs as Burnham’s shuttle flies in, the reattchment of the ship's nacelles and Burnham's use of the term “Red Directive” implies that this is due to Kovich/Daniels’ instructions, and the restoration of the original ship is to bring it in line with history due to timey-wimey reasons.

The title was first used in the context of the Progenitors in TNG: “The Chase” when Picard remarked, “[The puzzle] is 4 billion years old. A computer program from a highly advanced civilisation, and it's hidden in the very fabric of life itself.“ In DIS: “Red Directive” the phrase was used in conjunction with saying the Progenitor technology was “used to design life itself.”

Burnham activates her holographic tricorder function from her tricom badge, first introduced in DIS: “Scavengers” as the 32nd Century combination tricorder, communicator and personal transporter. She also materializes a 32nd Century phaser pistol, which can be summoned at will thanks to it being composed of programmable matter.

Window-like gateways allowing instantaneous travel to other worlds was a hallmark of another ancient civilization, the Iconians (TNG: “Contagion”), who used them to control a vast empire which was destroyed over 200,000 years prior, although there were still survivors existing into the 32nd Century (DIS: “The Examples”). Their gateways also survived, with one being the focus of conflict in DS9: “To the Death”.

Tahal’s fleet will arrive in 60 minutes. Primarch Tahal is one of the five remaining Primarchs of the Bree Imperium, and in the past conquered Kellerun, Rayner’s planet. Rayner was the only survivor of his family.

Burnham has indeed seen the future - in DIS: “Face the Strange” she and Rayner were jumped 30 years ahead to see a lifeless Discovery and a Federation HQ devastated by the Breen thanks to them using Progenitor tech.

Rayner refers to the avalanche caused by Moll and L’ak on Q’Mau in order to facilitate their escape (DIS: “Red Directive”).

Culber gives Book a shot to counter radiation sickness. In TOS: “The Deadly Years”, the drug of choice to do that was hyronalin, was which also used during the TNG era in several episodes. Culber has had an existential crisis ever since he became host to the memories and personality of Jinaal on Trill (DIS: “Jinaal”).

Moll put L’ak in her personal pattern buffer in DIS: “Lagrange Point” to keep him safe.

Using plasma to take out multiple hostiles was a tactic used by Worf’s brother Kurn, who went to warp near the surface of a star, setting off a flare which destroyed his pursuers (TNG: “Redemption II”). In TNG: “Descent, Part II”, the Enterprise-D under Beverly Crusher’s command fired a particle beam into a star to make it erupt and destroy a Borg ship.

Culber tells Book to adjust the tractor beam to subspace resonance frequency 5.1732, then uses the classic “I’m a doctor, not a…” trope associated most with McCoy from TOS (my personal favorite is from TOS: “The Devil in the Dark”, where he complains about treating the silicon-based Horta with, “I’m a doctor, not a bricklayer!”).

Ferengi rummy is presumably a card game. Rummy is the name given to a group of Earth card games, with the most common variant being Gin Rummy. It is claimed that the name comes from using rum as betting stakes.

The Progenitor that greets Burnham is in an updated version of the original Progenitor makeup from TNG: “The Chase” (played then by Salome Jens, who went on to play the female Founder in DS9).

The Galactic Barrier is an energy field that surrounds the Milky Way, penetrated first by the USS Enterprise in TOS: “Where No Man Has Gone Before” and then again in TOS: “By Any Other Name”. The Barrier also featured in DIS Season 4, with Species 10-C living beyond it in extragalactic space. The origins of the Barrier have never been explained on screen, although beta canon has offered some possibilities, one of which was the Progenitors (William Shatner and Judith and Garfield Reeves-Stevens’ Captain’s Glory).

The Progenitors were not the creators of the technology but think that it was made by their creators. So, basically, it’s Progenitors all the way down. And while they effectively could recreate a live body from a dead one, it would basically be a clone without any of the previous body’s memories or personality.

The Betazoid scientist Dr Marina Derex was one of those that discovered the Progenitor tech 800 years prior. Her clue was in the manuscript of her book, Labyrinths of the Mind (DIS: “Labyrinths”).

“Infinite diversity in Infinite Combinations” is a tenet of Vulcan philosophy, first mentioned in TOS: “Is There in Truth No Beauty?”, also known as IDIC. In-universe, it dates back to at least Surak’s time, c.300 CE (ENT: “The Forge”).

When Kovich tells her that all information regarding the Progenitor tech will be classified, Burnham quips she knows how those things work. When Discovery jumped to the 32nd Century at the end of Season 2 to prevent misuse of the Sphere Data, all knowledge of the spore drive was classified and scrubbed from 23rd century records, and even as far as the 32nd century was concerned the original Discovery was destroyed back then.

The device Burnham holds gives her access to the Infinity Room, a highly secure conference space, first seen in DIS: “Red Directive”.

Kovich cryptically says he’s “lived many years and many lives”. Given the scope of the Star Trek universe, this could very well be more than metaphorical. On the shelf behind him we see a bottle of Château Picard, Geordi LaForge’s VISOR and Benjamin Sisko’s baseball.

Agent Daniels first appeared in ENT: “Cold Front” as Crewman Daniels of the NX-01 Enterprise (which technically didn’t have a USS prefix until its refit). He was revealed to be a Time Agent, a temporal operative from the 31st Century fighting in the Temporal Cold War. He last appeared in ENT: “Storm Front, Part II”, informing Archer that due to his actions, the Temporal War was coming to an end.

Talaxians, of course, are Neelix’s race (VOY), last referenced in a reading list that included A Comprehensive Guide to Talaxian Hair Styles. The Eternal Archive also gave Book a cutting from the World Root, a tree system that extended across his now-destroyed planet Kwejian (DIS: “Labyrinths”). He planted it on Sanctuary Four, a planet used as a wildlife sanctuary for trance worms, one of which, nicknamed Molly was delivered there by Book in DIS: “That Hope is You, Part 1”.

The box on the table across from Admiral Burnham’s bed is the one made of Tulí wood, that contained the World Root cuttings, given to Book by the Eternal Archive. The color of the vegetation outside the window identifies the planet as Sanctuary Four.

Crepuscula was the very first planet we saw in the series, back in the first scene of DIS: “The Vulcan Hello”. Burnham and Philippa Georgiou performed a covert mission to restore the Crepusulans’ water supply, as the species was subject to General Order 1.

The age of Burnham’s son (and his Captain’s rank) implies that at least thirty-odd years have passed since Saru’s wedding.

Technically speaking, one “aye” means “I understand,” in response to information while “aye aye” means “I understand and will comply,” in response to an order.

Burnham’s shuttle bears the designation “UFP 47”, with 47 being a number which appears frequently in Star Trek, an in-joke started by TNG writer Joe Menosky, who was part of the 47 Society at California’s Pomona College. In the lake we see trance worms swimming. The warp streaks as the shuttle travels are consistent with what we saw of the pathway drive.

Burnham and Book’s son is named Leto, after Book’s nephew who died when Kwejian was destroyed (DIS: “Kobayashi Maru”).

The ending finally brings continuity in line with ST: “Calypso”, where Craft came across a deserted Discovery, empty save for Zora, adrift for a thousand years in deep space. For the longest time we were wondering how it would work since the starship was shown without its “A” suffix, which she obtained when refitted in the 32nd Century to hide her origins in the 23rd Century. The removal of the “A” by DOTs as Burnham’s shuttle flies in, the reattchment of the ship's nacelles and Burnham's use of the term “Red Directive” implies that this is due to Kovich/Daniels’ instructions, and the restoration of the original ship is to bring it in line with history due to timey-wimey reasons.

The title refers to points of gravitational equilibrium in space between two gravitationally massive objects, named Lagrange points after Italian scientist Joseph-Louis Lagrange (1736-1813). Five Lagrange points can be defined for two bodies. Lagrange points are well known in science fiction as locations where orbital colonies like O’Neill cylinders can be anchored with minimal need for thrusters to keep them from drifting.

Tahal was the Breen Primarch that made Kellerun into a forward base in the past, as stated by Rayner in DIS: “Erigah”.

Rillak is informed that Moll’s dreadnought has exited a transwarp tunnel. Transwarp conduits were first seen being used by the Borg to achieve speeds at least twenty times more than a Galaxy-class ship’s maximum warp (TNG: “Descent”). After the Borg were decimated in VOY: “Endgame”, the conduits remained and were utilized by others (PIC: “Broken Pieces”). In the 32nd Century, Osyraa used a transwarp tunnel to chase down Discovery (DIS: “Su’Kal”.). The use of transwarp networks might explain how the Breen dealt with the deactivation of dilithium during the Burn.

Discovery has a cloaking device, fitted when it was installed with 32nd Century technology (DIS: “That Hope is You, Part 2”). As per last week’s annotations, the 24th Century prohibition against the Federation using cloaking technology due to the Treaty of Algeron no longer appears to apply.

Primordial black holes are black holes that are believed to have formed very soon after the Big Bang. In Season 4, it was hypothesized that the Dark Matter Anomaly might have been a primordial wormhole, but this turned out to be incorrect (DIS: “Anomaly”).

From the viewscreen, the Progenitor technology is anchored at Lagrange Point 1, or L1, between the two bodies where their gravitational forces and centrifugal force balance out. The problem, however, is that L1, L2 and L3 are not great positions because they are still dynamically unstable, meaning objects there will still fall out of orbit without regular course and attitude corrections (every three weeks or so). Also, L4 and L5 are stable but only if the mass ratio between the two masses exceeds 24.96, which means the second black hole has to be much smaller than the first one for that to work. Not that real-world physics ever got in the way of the Rule of Cool in Star Trek, but still, if you're going to call an episode "Lagrange Point"…

Duranium alloys are commonly used in starship and starbase hulls across the galaxy. According to the Deep Space Nine Technical Manual, duranium occurs naturally in planetary crusts.

The EDF refers to the Earth Defence Force, which was the primary military arm of Earth prior to them rejoining the Federation (DIS: “People of Earth”). Despite being host to a Trill symbiont, Adira is human and was a member of the EDF at the time they took on the symbiont.

An unshielded exhaust port is, of course, the critical vulnerability of the first Death Star from Star Wars. As stated in DIS: “Labyrinths”, Breen code is in base-20, or duodeca.

Kira and Dukat also took advantage of Breen full-body suits, using them as a disguise in DS9: “Indiscretion” when they infiltrated a Breen labor camp.

The use of a transporter pattern buffer to preserve bodies was first seen in TNG: “Relics”, and subsequently used in DS9: “Our Man Bashir” and VOY: “Counterpoint”. We’ve also seen it used for medical reasons in SNW Season 1 (M’Benga’s daughter and during the Klingon War in SNW: “Under the Cloak of War”) and in DIS: “Stormy Weather”. As a security precaution, enemies can also be held in mid-transport as seen in TOS: “Day of the Dove”.

Primarch Ruhn also called the Federation “spineless, insignificant achworms” in DIS: “Erigah”.

The Pathway drive is a prototype stardrive of which little has been revealed. The prototype was installed on the Voyager-J for testing (DIS: “Kobayashi Maru”) the previous year. This is the first time that it’s been stated that the Mitchell also has one, perhaps indicating that it is out of the testing phase.

We are reminded again that Burnham’s primary training is in xenoanthropology (DIS: “The Vulcan Hello”).

“A grum of osikod” is a quotation from the Kellerun Ballad of Krul (DIS: “Mirrors”). From context it seems to mean the equivalent of “a pinch of salt”. But referencing Kellerun gives Rayner the cue to pay attention when Burnham says “flying out there all alone, out in space… I always knew my crew would come for me.”

“Failure is not an option,” is a saying famously associated with NASA Flight Director Gene Kranz during the Apollo 13 rescue mission, although he never actually said it. It was coined for the 1995 movie and became the tagline for it.

The title refers to points of gravitational equilibrium in space between two gravitationally massive objects, named Lagrange points after Italian scientist Joseph-Louis Lagrange (1736-1813). Five Lagrange points can be defined for two bodies. Lagrange points are well known in science fiction as locations where orbital colonies like O’Neill cylinders can be anchored with minimal need for thrusters to keep them from drifting.

Tahal was the Breen Primarch that made Kellerun into a forward base in the past, as stated by Rayner in DIS: “Erigah”.

Rillak is informed that Moll’s dreadnought has exited a transwarp tunnel. Transwarp conduits were first seen being used by the Borg to achieve speeds at least twenty times more than a Galaxy-class ship’s maximum warp (TNG: “Descent”). After the Borg were decimated in VOY: “Endgame”, the conduits remained and were utilized by others (PIC: “Broken Pieces”). In the 32nd Century, Osyraa used a transwarp tunnel to chase down Discovery (DIS: “Su’Kal”). The use of transwarp networks might explain how the Breen dealt with the deactivation of dilithium during the Burn.

Discovery has a cloaking device, fitted when it was installed with 32nd Century technology (DIS: “That Hope is You, Part 2”). As per last week’s annotations, the 24th Century prohibition against the Federation using cloaking technology due to the Treaty of Algeron no longer appears to apply.

Primordial black holes are black holes that are believed to have formed very soon after the Big Bang. In Season 4, it was hypothesized that the Dark Matter Anomaly might have been a primordial wormhole, but this turned out to be incorrect (DIS: “Anomaly”).

From the viewscreen, the Progenitor technology is anchored at Lagrange Point 1, or L1, between the two bodies where their gravitational forces and centrifugal force balance out. The problem, however, is that L1, L2 and L3 are not great positions because they are still dynamically unstable, meaning objects there will still fall out of orbit without regular course and attitude corrections (every three weeks or so). Also, L4 and L5 are stable but only if the mass ratio between the two masses exceeds 24.96, which means the second black hole has to be much smaller than the first one for that to work. Not that real-world physics ever got in the way of the Rule of Cool in Star Trek, but still, if you're going to call an episode "Lagrange Point"…

Duranium alloys are commonly used in starship and starbase hulls across the galaxy. According to the Deep Space Nine Technical Manual, duranium occurs naturally in planetary crusts.

The EDF refers to the Earth Defence Force, which was the primary military arm of Earth prior to them rejoining the Federation (DIS: “People of Earth”). Despite being host to a Trill symbiont, Adira is human and was a member of the EDF at the time they took on the symbiont.

An unshielded exhaust port is, of course, the critical vulnerability of the first Death Star from Star Wars. As stated in DIS: “Labyrinths”, Breen code is in base-20, or duodeca.

Kira and Dukat also took advantage of Breen full-body suits, using them as a disguise in DS9: “Indiscretion” when they infiltrated a Breen labor camp.

The use of a transporter pattern buffer to preserve bodies was first seen in TNG: “Relics”, and subsequently used in DS9: “Our Man Bashir” and VOY: “Counterpoint”. We’ve also seen it used for medical reasons in SNW Season 1 (M’Benga’s daughter and during the Klingon War in SNW: “Under the Cloak of War”) and in DIS: “Stormy Weather”. As a security precaution, enemies can also be held in mid-transport as seen in TOS: “Day of the Dove”.

Primarch Ruhn also called the Federation “spineless, insignificant achworms” in DIS: “Erigah”.

The Pathway drive is a prototype stardrive of which little has been revealed. The prototype was installed on the Voyager-J for testing (DIS: “Kobayashi Maru”) the previous year. This is the first time that it’s been stated that the Mitchell also has one, perhaps indicating that it is out of the testing phase.

We are reminded again that Burnham’s primary training is in xenoanthropology (DIS: “The Vulcan Hello”).

“A grum of osikod” is a quotation from the Kellerun Ballad of Krul (DIS: “Mirrors”). From context it seems to mean the equivalent of “a pinch of salt”. But referencing Kellerun gives Rayner the cue to pay attention when Burnham says “flying out there all alone, out in space… I always knew my crew would come for me.”

“Failure is not an option,” is a saying famously associated with NASA Flight Director Gene Kranz during the Apollo 13 rescue mission, although he never actually said it. It was coined for the 1995 movie and became the tagline for it.

The title refers to Labyrinths of the Mind, a book written by Dr Marina Derex, a Betazoid and one of the group that hid the Progenitor technology 800 years prior. A labyrinth is also a term for a maze, the original designed by the inventor Daedelus of Greek myth to house the Minotaur.

As mentioned in DIS: “Erigah”, L’ak was the Scion, a direct descendant of the Breen emperor, and held the genetic code of the Yod-Thot, “they who rule”, without whom his uncle, Primarch Ruhn, could not claim the throne. In DIS: “Jinaal”, Stamets discovered the the Progenitor techonlogy could potentially bring someone back to life.

Discovery jumps to just outside the Badlands, first appearing in DS9: “The Maquis” as an area of violent plasma storms in proximity to Bajor and Cardassia.

The shape of Hy’Rell’s head bumps resemble those of Xindi-Primates, first appearing in ENT: “The Xindi”, one of six intelligent Xindi species that were native to Xindus. The other possibility, taking into account her long white hair and blue eyes, is that she’s an Efrosian (ST VI).

Cerenkov radiation is created when particles exceed the speed of light in a given medium, creating a shockwave with a characteristic blue glow. In real life, it is most often seen around nuclear reactors submerged in water (the speed of light in water is 75% of that in vacuum, allowing emissions from the reactor to exceed that).

Discovery was given the ability to cloak when it was refitted (DIS: “That Hope is You, Part 2”). During the 24th Century, the Treaty of Algeron forbade the Federation from using or developing cloaking devices (TNG: "The Pegasus"), with a notable exception being the Defiant during the Dominion War (DS9: “The Search”). Apparently that prohibition no longer applies in the 32nd Century. Cerenkovn, Book’s world, was destroyed in DIS: “Kobayashi Maru”, making him one of the last of his species.

The scenes in the Eternal Archive were filmed at the Thomas Fisher Rare Book Library in Toronto, Canada.

An oubliette is a specific type of dungeon, of which the only access is a trap door installed in the ceiling of the dungeon, and usually extremely narrow, such that the prisoner was unable to sit down.

The Tuli tree was native to Kwejian and had a distinctive smell to its sap. The decor of Book’s ship was made to simulate Tuli wood (DIS: “Stormy Weather”). Inside the box are cuttings from the World Root, a tree root system that reached all the way around the planet (DIS: “Kobayashi Maru”) and was sacred to the Kwejian.

Culber identifies the device affecting Burnham as a nucleonic emitter. Nucleonic particles appear in a number of places in Star Trek lore, but most appropriately in TNG: “The Inner Light”, where a nucleonic beam from a Kataan probe was responsible for sending Picard into a mindscape where he lived out a simulated lifetime in a similar manner to what Burnham is experiencing. In that episode, an attempt to disrupt the beam nearly killed Picard, which is the risk Culber is alluding to.

The old school card index drawers Burnham looks at makes me nostalgic for the days when I was a student librarian (yes, I’m old). The mindscape Archives’ category number for history is 002818/5 - in our Dewey Decimal System, history (and geography) is 900.

Book says “Those who learn history aren’t doomed to repeat it.” The usual phrasing of that adage is “Those who do not learn from history are doomed to repeat it.” The philosopher George Satayana is credited with the original “Those who cannot remember the past are condemned to repeat it.”

Burnham refers to the itronok, a predatory species they encounted on Trill while searching for the clue there (DIS: “Jinaal”).

Trémaux’s algorithm is a maze-solving method devised by Charles Pierre Trémaux, which involves drawing lines on the floor marking a path. A version of it - called a depth first search - is used to search tree or graph data structures.

Derex’s reading list references Talaxians, Neelix’s species from VOY and Hupyrians, the species of the Ferengi Grand Nagus’ servants (DS9: “The Nagus”, et al.). Euclid was a Greek mathematician who devised an axiomatic system for geometry.

Rhys intends to use the plasma storms for cover, which is exactly what made the Badlands effective as a hiding place for the Bajoran Resistance and the Maquis back in their day.

Matching weapons to shield frequencies to get past them is a tried and true method, demonstrated most dramatically when the Enterprise-D was destroyed in ST: Generations. Duodeca is a base-20 system.

Hysperia is a planet where the inhabitants have a culture based on a medieval fantasy motif (LD: “Where Pleasant Fountains Lie”). In the 24th Century, Chief Engineer Billups of the USS Cerritos was a native of Hysperia and the ostensible Crown Prince, although he abdicated that position.

Commander Jemison shares a last name with former astronaut Mae Jemison, the first African-American woman in space, who appeared in TNG: “Second Chances” as LT jg Palmer.

A tergun is a sacred Breen oath. Ruhn’s remark that the Federation to save the few would risk the many is reminiscent of Kirk’s inversion in ST III of Spock’s adage about the needs of the many and the few from ST II: “The needs of the one outweighed the needs of the many.”

“Never turn your back on a Breen” is a Romulan saying (DS9: “By Inferno’s Light”), cited by Rayner in DIS: “Erigah”.

The title refers to Labyrinths of the Mind, a book written by Dr Marina Derex, a Betazoid and one of the group that hid the Progenitor technology 800 years prior. A labyrinth is also a term for a maze, the original designed by the inventor Daedelus of Greek myth to house the Minotaur.

As mentioned in DIS: “Erigah”, L’ak was the Scion, a direct descendant of the Breen emperor, and held the genetic code of the Yod-Thot, “they who rule”, without whom his uncle, Primarch Ruhn, could not claim the throne. In DIS: “Jinaal”, Stamets discovered the the Progenitor techonlogy could potentially bring someone back to life.

Discovery jumps to just outside the Badlands, first appearing in DS9: “The Maquis” as an area of violent plasma storms in proximity to Bajor and Cardassia.

The shape of Hy’Rell’s head bumps resemble those of Xindi-Primates, first appearing in ENT: “The Xindi”, one of six intelligent Xindi species that were native toCerenkov The other possibility, taking into account her long white hair and blue eyes, is that she’s an Efrosian (ST VI).

Cerenkov radiation is created when particles exceed the speed of light in a given medium, creating a shockwave with a characteristic blue glow. In real life, it is most often seen around nuclear reactors submerged in water (the speed of light in water is 75% of that in vacuum, allowing emissions from the reactor to exceed that).

Discovery was given the ability to cloak when it was refitted (DIS: “That Hope is You, Part 2”). During the 24th Century, the Treaty of Algeron forbade the Federation from using or developing cloaking devices (TNG: "The Pegasus"), with a notable exception being the Defiant during the Dominion War (DS9: “The Search”). Apparently that prohibition no longer applies in the 32nd Century.

Kwejian, Book’s world, was destroyed in DIS: “Kobayashi Maru”, making him one of the last of his species.

The scenes in the Eternal Archive were filmed at the Thomas Fisher Rare Book Library in Toronto, Canada.

An oubliette is a specific type of dungeon, of which the only access is a trap door installed in the ceiling of the dungeon, and usually extremely narrow, such that the prisoner was unable to sit down.

The Tuli tree was native to Kwejian and had a distinctive smell to its sap. The decor of Book’s ship was made to simulate Tuli wood (DIS: “Stormy Weather”). Inside the box are cuttings from the World Root, a tree root system that reached all the way around the planet (DIS: “Kobayashi Maru”) and was sacred to the Kwejian.

Culber identifies the device affecting Burnham as a nucleonic emitter. Nucleonic particles appear in a number of places in Star Trek lore, but most appropriately in TNG: “The Inner Light”, where a nucleonic beam from a Kataan probe was responsible for sending Picard into a mindscape where he lived out a simulated lifetime in a similar manner to what Burnham is experiencing. In that episode, an attempt to disrupt the beam nearly killed Picard, which is the risk Culber is alluding to.

The old school card index drawers Burnham looks at makes me nostalgic for the days when I was a student librarian (yes, I’m old). The mindscape Archives’ category number for history is 002818/5 - in our Dewey Decimal System, history (and geography) is 900.

Book says “Those who learn history aren’t doomed to repeat it.” The usual phrasing of that adage is “Those who do not learn from history are doomed to repeat it.” The philosopher George Satayana is credited with the original “Those who cannot remember the past are condemned to repeat it.”

Burnham refers to the itronok, a predatory species they encounted on Trill while searching for the clue there (DIS: “Jinaal”).

Trémaux’s algorithm is a maze-solving method devised by Charles Pierre Trémaux, which involves drawing lines on the floor marking a path. A version of it - called a depth first search - is used to search tree or graph data structures.

Derex’s reading list references Talaxians, Neelix’s species from VOY and Hupyrians, the species of the Ferengi Grand Nagus’ servants (DS9: “The Nagus”, et al.). Euclid was a Greek mathematician who devised an axiomatic system for geometry.

Rhys intends to use the plasma storms for cover, which is exactly what made the Badlands effective as a hiding place for the Bajoran Resistance and the Maquis back in their day.

Matching weapons to shield frequencies to get past them is a tried and true method, demonstrated most dramatically when the Enterprise-D was destroyed in ST: Generations. Duodeca is a base-20 system.

Hysperia is a planet where the inhabitants have a culture based on a medieval fantasy motif (LD: “Where Pleasant Fountains Lie”). In the 24th Century, Chief Engineer Billups of the USS Cerritos was a native of Hysperia and the ostensible Crown Prince, although he abdicated that position.

Commander Jemison shares a last name with former astronaut Mae Jemison, the first African-American woman in space, who appeared in TNG: “Second Chances” as LT jg Palmer.

A tergun is a sacred Breen oath. Ruhn’s remark that the Federation to save the few would risk the many is reminiscent of Kirk’s inversion in ST III of Spock’s adage about the needs of the many and the few from ST II: “The needs of the one outweighed the needs of the many.”

“Never turn your back on a Breen” is a Romulan saying (DS9: “By Inferno’s Light”), cited by Rayner in DIS: “Erigah”.

As stated in DIS: “Mirrors”, an erigah is a Breen blood bounty.

The ship holding Moll and L’ak’s shuttle in a tractor beam is the USS Locherer (NCC-325062), a Merian-class starship first seen in DIS: “Jinaal” and named after the late J.P. Locherer, who was a cinematographer on the show.

Burnham identifies subspace frequency Epsilon 19 as a courier channel and that “special offer” is a courier distress code. With her is Commander Nhan, a Barzan who journeyed with Discovery from the 23rd Century but subsequently transferred to Federation Security in the 32nd. She was last seen in DIS: “Rubicon”.

Nhan refers to what happened between her and Book at their last encounter, when she argued for destroying his ship to prevent him using the isolytic weapon she mentioned. So there’s a bit of awkward history there.

A sa-te kru cat is a Vulcan species, a large predator similar to the le-matya. It was mentioned in the novel Vulcan’s Forge, but this is its first on-screen mention.

Given the Breen first appeared in DS9, there are plenty of back references to the series.

Culber says that there’s some evidence Breen are capable of “somatic cell” regeneration in extreme cold. This tracks with reports that the Breen homeworld had a freezing climate (DS9: “Til Death Do Us Part”) and that they wore refrigeration suits (DS9: “The Changing Face of Evil”). I’m not sure why Culber needs to distinguish “somatic cell”, since that is really any other cell in the body aside from sperm and egg cells, but I guess it sounds medically cool.

Breen Dreadnoughts (Rezeth Destroyers) are ships from Star Trek Online. As we see later, the 32nd Century version is much bigger.

The Breen used to be a Confederacy in the 24th Century (DS9: “Strange Bedfellows”) but somewhere along the way it’s become an Imperium. There are six primarchs vying for the throne in the wake of the emperor’s death.

Rayner talks about the last time the Breen entered Federation space. With Vance saying that Starfleet was caught flat-footed, this is probably referring to the Breen sneak attack on Earth during the Dominion War which heavily damaged Starfleet Headquarters and San Francisco (“The Changing Face of Evil”). Tilly’s later remark about the Breen “destroying an entire city” may also refer to this.

Using thoron emitters and duranium shadows to fool enemy sensors is a reference to DS9: “Emissary”, when the station used such a tactic to block sensors and make themselves appear better armed than they were. In DS9: “The Way of the Warrior”, the Changeling Martok believed the station was pulling the same trick, but that time he proved to be wrong. The Romulan saying “Never turn your back on a Breen” is from DS9: “By Inferno’s Light”.

The yellow alert symbols are the same design as the “Alert: Condition Red” indicators dating back to ST II, albeit in yellow. The USS Mitchell (NCC-325027), another Merian-class starship, is named after the late Kenneth Mitchell, who played Kol, Kol-sha and Aurellio in DIS. She was last mentioned in DIS: “Coming Home”.

L’ak is Primarch Ruhn’s nephew and carries within him the genetic code of the Yod-Thot, “they who rule”. He is also a direct descendant of the emperor and Ruhn cannot claim the throne without him.

One of Reno’s former jobs was as a bartender - the closed captioning says “Ashalon IV”, but it might be a misspelling of “ Aschelan IV”. Aschelan V was a planet which housed a Cardassian fuel depot (DS9: “Dreadnought”). She refers to a cocktail named “Seven of Limes”, which is an obvious pun on Seven of Nine, although Reno may not know the name’s provenance given that she left for the future about a century before Annika Hansen was assimilated.

A “Code One Alpha” is probably related to or the same as the 23rd-24th Century “Code One Alpha Zero” which is an emergency condition ordered when there is an attack (ST 2009) or a distress call (TNG: “Relics”).

Kellerun was, for a time, used as a Breen forward base by Primarch Tahal. Since Rayner was there, it must have been relatively recent, although to be fair we don’t know how long Kellerun live.

Reno remarks that the hunt “sounds like something out of a holodeck adventure for the littles.” She may be referring to The Littles, a series of children’s adventure novels featuring a family of tiny humanoids with mice-like faces and tails that were written between 1967 and 2003 by John Peterson. There was also an animated series that ran for 3 seasons between 1983 and 1985. Or I’m overthinking and she’s just talking about kids in general.

Rayner says Tahal named her ship the Tau Ceti after a lethal viper with a slow acting venom. Tau Ceti, is of course, the name of a star 12 light years away from Earth and has been mentioned many times in Star Trek.

Bopak III was an uninhabited planet (at least in 2372) in the Gamma Quadrant and the location for the events of DS9: “Hippocratic Oath”.

Tricordrazine is a stimulant apparently derived from cordrazine (TOS: “The City on the Edge of Forever”) and appeared in several TNG episodes, including TNG: “Ethics” and “Shades of Grey”.

The Badlands is an area of space in proximity to Cardassia and Bajor (and DS9), known for its violent plasma storms (DS9: “The Maquis”). Both the Bajoran Resistance and the Maquis used it as a staging area to hide from enemy patrols during their respective conflicts. In 2371, while pursuing a Maquis ship there, the USS Voyager was hurled across the galaxy to the Delta Quadrant by an alien force (VOY: “Caretaker”).

As stated in DIS: “Mirrors”, an erigah is a Breen blood bounty.

The ship holding Moll and L’ak’s shuttle in a tractor beam is the USS Locherer (NCC-325062), a Merian-class starship first seen in DIS: “Jinaal” and named after the late J.P. Locherer, who was a cinematographer on the show.

Burnham identifies subspace frequency Epsilon 19 as a courier channel and that “special offer” is a courier distress code. With her is Commander Nhan, a Barzan who journeyed with Discovery from the 23rd Century but subsequently transferred to Federation Security in the 32nd. She was last seen in DIS: “Rubicon”.

Nhan refers to what happened between her and Book at their last encounter, when she argued for destroying his ship to prevent him using the isolytic weapon she mentioned. So there’s a bit of awkward history there.

A sa-te kru cat is a Vulcan species, a large predator similar to the le-matya. It was mentioned in the novel Vulcan’s Forge, but this is its first on-screen mention.

Given the Breen first appeared in DS9, there are plenty of back references to the series.

Culber says that there’s some evidence Breen are capable of “somatic cell” regeneration in extreme cold. This tracks with reports that the Breen homeworld had a freezing climate (DS9: “Til Death Do Us Part”) and that they wore refrigeration suits (DS9: “The Changing Face of Evil”). I’m not sure why Culber needs to distinguish “somatic cell”, since that is really any other cell in the body aside from sperm and egg cells, but I guess it sounds medically cool.

Breen Dreadnoughts (Rezeth Destroyers) are ships from Star Trek Online. As we see later, the 32nd Century version is much bigger.

The Breen used to be a Confederacy in the 24th Century (DS9: “Strange Bedfellows”) but somewhere along the way it’s become an Imperium. There are six primarchs vying for the throne in the wake of the emperor’s death.

Rayner talks about the last time the Breen entered Federation space. With Vance saying that Starfleet was caught flat-footed, this is probably referring to the Breen sneak attack on Earth during the Dominion War which heavily damaged Starfleet Headquarters and San Francisco (“The Changing Face of Evil”). Tilly’s later remark about the Breen “destroying an entire city” may also refer to this.

Using thoron emitters and duranium shadows to fool enemy sensors is a reference to DS9: “Emissary”, when the station used such a tactic to block sensors and make themselves appear better armed than they were. In DS9: “The Way of the Warrior”, the Changeling Martok believed the station was pulling the same trick, but that time he proved to be wrong. The Romulan saying “Never turn your back on a Breen” is from DS9: “By Inferno’s Light”.

The yellow alert symbols are the same design as the “Alert: Condition Red” indicators dating back to ST II, albeit in yellow. The USS Mitchell (NCC-325027), another Merian-class starship, is named after the late Kenneth Mitchell, who played Kol, Kol-sha and Aurellio in DIS. She was last mentioned in DIS: “Coming Home”.

L’ak is Primarch Ruhn’s nephew and carries within him the genetic code of the Yod-Thot, “they who rule”. He is also a direct descendant of the emperor and Ruhn cannot claim the throne without him.

One of Reno’s former jobs was as a bartender - the closed captioning says “Ashalon IV”, but it might be a misspelling of “ Aschelan IV”. Aschelan V was a planet which housed a Cardassian fuel depot (DS9: “Dreadnought”). She refers to a cocktail named “Seven of Limes”, which is an obvious pun on Seven of Nine, although Reno may not know the name’s provenance given that she left for the future about a century before Annika Hansen was assimilated.

A “Code One Alpha” is probably related to or the same as the 23rd-24th Century “Code One Alpha Zero” which is an emergency condition ordered when there is an attack (ST 2009) or a distress call (TNG: “Relics”).

Kellerun was, for a time, used as a Breen forward base by Primarch Tahal. Since Rayner was there, it must have been relatively recent, although to be fair we don’t know how long Kellerun live.

Reno remarks that the hunt “sounds like something out of a holodeck adventure for the littles.” She may be referring to The Littles, a series of children’s adventure novels featuring a family of tiny humanoids with mice-like faces and tails that were written between 1967 and 2003 by John Peterson. There was also an animated series that ran for 3 seasons between 1983 and 1985. Or I’m overthinking and she’s just talking about kids in general.

Rayner says Tahal named her ship the Tau Ceti after a lethal viper with a slow acting venom. Tau Ceti, is of course, the name of a star 12 light years away from Earth and has been mentioned many times in Star Trek.

Bopak III was an uninhabited planet (at least in 2372) in the Gamma Quadrant and the location for the events of DS9: “Hippocratic Oath”.

Tricordrazine is a stimulant apparently derived from cordrazine (TOS: “The City on the Edge of Forever”) and appeared in several TNG episodes, including TNG: “Ethics” and “Shades of Grey”.

The Badlands is an area of space in proximity to Cardassia and Bajor (and DS9), known for its violent plasma storms (DS9: “The Maquis”). Both the Bajoran Resistance and the Maquis used it as a staging area to hide from enemy patrols during their respective conflicts. In 2371, while pursuing a Maquis ship there, the USS Voyager was hurled across the galaxy to the Delta Quadrant by an alien force (VOY: “Caretaker”).

The USS Locherer, a Merian-class starship, was first seen in DIS: “Jinaal”. It is named after the late JP Locherer, who was a cinematographer on DIS before he passed in 2022.

Kovich says he likes the feel of paper. A similar preference for “old-fashioned” books over electronic versions was exhibited by attorney Samuel T. Cogley in TOS: “Court Martial”. Fanon has often held that it was Cogley who passed on his love of physical books to Kirk, who from then on, as Spock noted in ST II, had a fondness for antiques.

Culber’s abuela is of course a simulation, since the real one would have died nearly a millennium before. The use of holograms as grief alleviation therapy was also in the Marvel Cinematic Universe, invented by Tony Stark as seen in Captain America: Civil War. Reflecting current events, people have been trying to AI to recreate the personalities of deceased loved ones.

The list of names are: Jinaal Bix (Trill, “Jinaal”), Carmen Cho (Terran, “Mirrors”), Vellek (Romulan, “Red Directive”), and the two not yet encountered Marina Derex (Betazoid) and Hitoroshi Kreel (Denobulan).

Silver iodide is indeed used in cloud seeding in order to encourage precipitation. Atmospheric extraction is also a very old method of getting water dating back as far back as the Incas. In science fiction, it’s probably best represented by the moisture farms on Tattooine in the Star Wars movies.

Halem’no has a pre-warp and pre-industrial civilization, so the Prime Directive applies. A discussion about whether or not Kreel already violated the PD by putting up the towers in the first place is beyond the scope of these annotations, but I’m looking forward to reading the discussions.

Whistled languages are rare, but exist on Earth, in various cultures. Michael’s enthusiasm for it speaks of her primary training as a xenoanthropologist (DIS: “The Vulcan Hello”).

Subcutaneous transponders date all the way back to the 22nd Century, first appearing in TOS: “Patterns of Force”. Subdermal communicators/transponders also appeared in ENT: “Stratagem”, TNG: “Who Watches the Watchers” and VOY: “Workforce”. This the first appearance of retinal tricorders.

The Halem’nite “sound cure” may look mystical and exotic, but they’re actually just using Tibetan singing bowls, albeit with a more intense effect.

Tilly is using a simplified Newton’s First Law (or the principle of inertia) as a mantra: a body in motion remains in motion in straight line, a body at rest remains at rest - unless acted on by an external force.

Tritanium is a super-hard metal first mentioned in TOS: “Obsession”, being 21.4 times as hard as diamond. In TNG: “The Arsenal of Freedom” Riker claimed that melting tritanium was beyond 24th Century technology. The metal routinely shows up in hulls, walls, tools, ammunition, etc. so while it may not be able to melt, it can certainly be fabricated with.

Culber uses the “they” pronoun to refer to Ravah.

Culber introduces Book to his abuela’s mofongo con pollo al ajillo. Mofongo is a Puerto Rican dish made from plantains mashed with fat. This variation is served with chicken (pollo) with an oil infused with garlic and guajillo chile (al ajillo).

The USS Locherer, a Merian-class starship, was first seen in DIS: “Jinaal”. It is named after the late JP Locherer, who was a cinematographer on DIS before he passed in 2022.

Kovich says he likes the feel of paper. A similar preference for “old-fashioned” books over electronic versions was exhibited by attorney Samuel T. Cogley in TOS: “Court Martial”. Fanon has often held that it was Cogley who passed on his love of physical books to Kirk, who from then on, as Spock noted in ST II, had a fondness for antiques.

Culber’s abuela is of course a simulation, since the real one would have died nearly a millennium before. The use of holograms as grief alleviation therapy was also in the Marvel Cinematic Universe, invented by Tony Stark as seen in Captain America: Civil War. Reflecting current events, people have been trying to AI to recreate the personalities of deceased loved ones.

The list of names are: Jinaal Bix (Trill, “Jinaal”), Carmen Cho (Terran, “Mirrors”), Vellek (Romulan, “Red Directive”), and the two not yet encountered Marina Derex (Betazoid) and Hitoroshi Kreel (Denobulan).

Silver iodide is indeed used in cloud seeding in order to encourage precipitation. Atmospheric extraction is also a very old method of getting water dating back as far back as the Incas. In science fiction, it’s probably best represented by the moisture farms on Tattooine in the Star Wars movies.

Halem’no has a pre-warp and pre-industrial civilization, so the Prime Directive applies. A discussion about whether or not Kreel already violated the PD by putting up the towers in the first place is beyond the scope of these annotations, but I’m looking forward to reading the discussions.

Whistled languages are rare, but exist on Earth, in various cultures. Michael’s enthusiasm for it speaks of her primary training as a xenoanthropologist (DIS: “The Vulcan Hello”).

Subcutaneous transponders date all the way back to the 22nd Century, first appearing in TOS: “Patterns of Force”. Subdermal communicators/transponders also appeared in ENT: “Stratagem”, TNG: “Who Watches the Watchers” and VOY: “Workforce”. This the first appearance of retinal tricorders.

The Halem’nite “sound cure” may look mystical and exotic, but they’re actually just using Tibetan singing bowls, albeit with a more intense effect.

Tilly is using a simplified Newton’s First Law (or the principle of inertia) as a mantra: a body in motion remains in motion in straight line, a body at rest remains at rest - unless acted on by an external force.

Tritanium is a super-hard metal first mentioned in TOS: “Obsession”, being 21.4 times as hard as diamond. In TNG: “The Arsenal of Freedom” Riker claimed that melting tritanium was beyond 24th Century technology. The metal routinely shows up in hulls, walls, tools, ammunition, etc. so while it may not be able to melt, it can certainly be fabricated with.

Culber uses the “they” pronoun to refer to Ravah.

Culber introduces Book to his abuela’s mofongo con pollo al ajillo. Mofongo is a Puerto Rican dish made from plantains mashed with fat. This variation is served with chicken (pollo) with an oil infused with garlic and guajillo chile (al ajillo).

The title of the episode, of course, pretty much telegraphs which parallel universe we’re likely to have elements of this week. The Mirror Universe was a major part of Season 1 of DIS, and the Mirror Philippa Georgiou was a supporting character through the first 3 seasons.

The Stardate is 866282.9. I’ve said this a lot, but the new Stardate system baffles me. By TNG reckoning the 866000s should be 3189, but they confirmed it was 3191 in DIS: “Jinaal”, so how it’s calculated now is anyone’s guess.

Book browses through Moll’s records - the first one is from the Federation, the third from Andor. I don’t recognize the logo or alien script from the second one, although it vaguely reminds me of Alienese from Futurama.

Burnham quotes from a Kellerun (Rayner’s species) classic, The Ballad of Krul, “Serve it without a grum of osikod.” From context it probably means not to sugarcoat whatever is said next, with “grum” as a quantity and “osikod” either as a flavoring ingredient, or a word meaning deception, i.e. “without an ounce of bullshit.”

Book makes reference to charging impulse capacitant cells and then releasing the energy into the drive coils. Impulse engines, although limited to sublight operations, have had warp driver coils as part of their design in various eras. In the 22nd Century, according to the USS Enterprise Haynes Manual, the NX-01 used the inertial mass-altering capabilities of a warp field to increase the apparent mass of ejected propellant to achieve greater thrust. In SNW: “Memento Mori”, there is a reference to only half impulse speed being achievable with one warp nacelle damaged. The TNG Technical Manual says that as of the mid-24th Century and the designing of the Ambassador-class, driver coils were built into impulse engines to lower the inertial mass of the ship so that even at sublight the ship would be easier to push.

Book is aware of the Mirror Universe, since he recognizes the ISS prefix (as opposed to USS) for Empire ships. And we see it is the ISS Enterprise, last seen in TOS: “Mirror, Mirror”.

Michael says that crossing between universes has been “impossible for centuries”. This is a stronger statement from from what Kovich said in DIS: “Die Trying”, when he stated that the MU and the Prime Universe had been drifting apart ever since Georgiou crossed over (back in the 23rd Century), and there hadn’t been a crossover between the two for 500 years. While it’s debated, I’m of the school of thought that Georgiou did cross universes (and time) during DIS: “Terra Firma” thanks to the Guardian of Forever. And in that same episode, Kovich related the tale of Yor, a Time Soldier, from the 2379 of the Kelvin Timeline to the 30th Century of the Prime Timeline.

Cardassian voles are rapidly breeding pests that are attracted to energy fields. They are native to Cardassia Prime and first mentioned in DS9, but have made appearances in ENT and also DIS Season 1. DS9 once suffered an infestation of voles.

A graviton pulse was used to seal up a subspace rupture in TNG: “Schisms”. While the idea is to use it to stop the antimatter reactions making the aperture pulse, the 43.7% chance of implosion sealing it forever makes sense with what it was used for in “Schisms”.

The bridge of the ISS Enterprise uses the same set as SNW, but with the Empire logos and a ISS dedication plaque as part of the redress. Michael wants to use the sensors to track quantum signatures from “our universe”. It was established in TNG: “Parallels” that every possible universe has a unique quantum signature as does its inhabitants.

Michael mentions her mirror counterpart and how she must have died before ISS Enterprise was trapped. The exact disposition of Mirror Michael is unclear. in DIS Season 1 she was lost in a shuttle accident and Prime Michael posed as her. In the licensed comic book Succession, (co-written by novel and series writer Kirsten Beyer) it was revealed that Mirror Michael had survived and managed to ascend to the throne, but she was in turn killed by Mirror Airiam. In DIS: “Terra Firma”, Mirror Michael finally makes an on-screen appearance. Mirror Georgiou and her fight and kill each other before Georgiou is returned to the 32nd Century, so it depends on whether you believe Georgiou was actually traveling in time or not or whether she was in the actual MU or not. In any event, Prime Michael is unaware of the events of the comic or Mirror Georgiou’s time/space travel.

Michael looks at her adoptive brother Spock’s station - or at least where it would be on the Prime Enterprise. Despite Michael’s assumption, Mirror Spock was not exactly “as ruthless as the rest”. As Prime Kirk described him in TOS: “Mirror, Mirror”, he was a man of integrity “in both universes”. Sadly, it would be Mirror Spock’s reforms towards peace that would lead to the Empire being toppled by a Klingon-Cardassian alliance.

The intermix chamber is where the matter/antimatter reaction of the warp core takes place. In TNG times, the entire warp core assembly consists of the intermix chamber plus the matter and antimatter injectors and tubes which is what is jettisoned when they order the warp core to be ejected (VOY: “Day of Honor”, et al.).

The plaque in the transporter room indicates Tartarus Base on Stardate 32336.6 - by TNG reckoning that would correspond with 2355, but who knows how the Terrans measured stardates? In any case, since they’re using the SNW sets, the ship itself is apparently showcasing mid-23rd Century levels of technology. Oddly, for a plaque apparently put up by dissidents, it says "Long Live The Empire". Tartarus Prime was mentioned as a planet with high temperatures in the novel The Rings of Time.

The Terran High Chancellor making reforms might be referring to Spock, who was said to have risen to be Commander-in-Chief of the Empire (DS9: “Crossover”). Mirror Saru was a Kelpien slave in the MU experienced by Georgiou in DIS: “Terra Firma” but was saved by her and consequently went on to save a lot of lives. If the plaque was put up in 2355, then these events would have taken place about 97 years after Mirror Saru was saved by Georgiou and about 88 years after Mirror Spock met Prime Kirk. We don't really know how long Kelpiens naturally live, but Su'Kal (the one who caused the Burn) lived to be over 120 years old, so it's possible.

Interestingly, there are holoemitters in Sickbay, which seem to indicate later-24th Century technology (i.e. the EMH of VOY). Of course, this is all assuming tech levels are consistent across universes. I have many questions.

An Erigah is a Breen blood bounty, and we have a fan theory confirmed: L’ak is indeed a member of the mysterious Breen that have never been seen unmasked on screen. In the Litverse, the Breen are actually a society rather than a single race, consisting of six species, none of whom match L’ak’s description.

In the flashback, the Breen Moll meets wear similar uniforms (although the helmets don’t have the pronounced “beak”) and speak the same unintelligible language from their appearances in DS9. The Breen also carry what must be a 32nd Century version of the neural truncheons they had in DS9, which acted like cattle prods.

Moll identifies L’ak as the “Primarch’s nephew”. Coincidentally, in DS9: “The Adversary” the leader of the Tzenkethi Coalition in the 24th Century is known as the “Autarch”.

When L’ak first removes his helmet, his skin and skull are almost transparent, reminding me of how the Gallamites were described with transparent skulls and brains twice the size of humans (DS9: “The Maquis, Part 1”). It seems that Breen skulls and skin get more opaque with exposure.

Callor V was previously mentioned in DIS: “Jinaal”. Rubindium is used in communications tech, first mentioned in TOS: “Patterns of Force” and subsequently in DIS: “Far from Home”. There is also a similar-sounding element called rubidium (VOY: “Think Tank”).

The Emerald Chain, an organized crime concern, was the central antagonist in Season 3, but are shattered by the end of it, so that dates the start of Moll and L’ak’s relationship to 3189.

Booker’s planet Kwejian was destroyed by the DMA in Season 4, in case anyone forgot, leaving him the last of his species.

The Primarch says L’ak carries the genetic code of the Yod-Thot, “They who Rule”. In DS9, “Thot” denoted a high rank (the script for DS9: “Strange Bedfellows” describes Thot Gor as a Breen general). As a side note, the Klingon word yoD means “shield”.

So Breen have “two faces”, one transparent and one not. Hopefully we can get some backstory to explain why this is, and why the non-transparent face is viewed with disdain. The weapon the Primarch materializes is a sleeker version of the 24th Century Breen rifle.

We see L’ak apparently bleeding, although the fluid isn’t red. In DS9: “In Purgatory’s Shadow”, Bashir says Breen don’t have blood, although how he knows this for sure is not explained. While this could be misinformation, some Earth invertebrates have circulatory systems that contain, not blood, but hemolymph, a fluid that carries carbohydrates, lipds, amino acides, hormones, etc. through the body. The Breen could be similar.

Rhys’s suggestion seems odd at first blush - don’t photon torpedoes already have antimatter in them? Then you realize his idea is to replace the matter in the torpedoes with antimatter as well, adding more antimatter to the aperture reactions. I’m still trying to figure out why hexagonal.

Michael comments that “hit it,” sounds weird and sticks with her own “let’s fly.” Of course, “hit it” was Pike’s catchphrase to go to warp.

I’m going to leave the question of how Stamets is able to recognize that it’s the ISS Enterprise from this distance unanswered. The setting and ending of the episode was kind of spoiled if you had paid attention to the Season 5 trailers anyway.

The face off between the ISS Enterprise and the refit Discovery reminds me of a similar face off between the USS Enterprise and Discovery at the end of Season 1 (DIS: “Will You Take My Hand?”).

Michael used the tractor beam earlier to signal 3-4-1-4, a reference to The Ballad of Krul Section 4, Verse 7 where Krul calls to his war brother for rescue with a drumbeat using that pattern.

I’m still kind of bummed we didn’t see any Tzenkethi despite being in their space. Which kind of makes me wonder what their status is in the 32nd Century.

Culber refers to his death and resurrection in Season 1 (DIS: “Despite Yourself” and “Saints of Imperfection”, respectively).

We find out that the MU refugees did make it to the PU, and one of them, Dr Cho, became a Branch Admiral in Starfleet. Presumably the trauma of existing in a different universe wasn’t as severe because there was no time travel involved, unlike Yor or Mirror Georgiou, who crossed universes and had a centuries-long gap.

The Branch Admiral rank was detailed in the FASA Star Trek RPG’s TNG Officer’s Manual, and was a new rank to extend Admiral’s rank and privileges to non-Command division positions like the Starfleet Surgeon General, or other divisions like Security or Engineering, or the Inspector General’s Office. This was to give them the requisite authority to carry out their policies.

Since Cho was a part of Jinaal’s group, which existed during the Dominion War (2373-2375), that makes the Starfleet. Presumably the trauma of existing in a different universe wasn’t as severe because there was no time travel involved, unlike Yor or Mirror Georgiouears old, assuming she was commissioned at the same time as her Prime counterpart, in 2245. Which leaves the question of why the tech is the same despite nearly a century apart up in the air, since they apparently added holoemitters. Maybe the show should have used the Enterprise-D sets from PIC Season 3. The Enterprise-D was commissioned between 2362 and 2364 (sources vary), so that’s actually a closer date.

The dedication at the end is to Allan Roy “Red” Marceta, who was a lead set dresser on DIS. He passed away in 2022.

The title of the episode, of course, pretty much telegraphs which parallel universe we’re likely to have elements of this week. The Mirror Universe was a major part of Season 1 of DIS, and the Mirror Philippa Georgiou was a supporting character through the first 3 seasons.

The Stardate is 866282.9. I’ve said this a lot, but the new Stardate system baffles me. By TNG reckoning the 866000s should be 3189, but they confirmed it was 3191 in DIS: “Jinaal”, so how it’s calculated now is anyone’s guess.

Book browses through Moll’s records - the first one is from the Federation, the third from Andor. I don’t recognize the logo or alien script from the second one, although it vaguely reminds me of Alienese from Futurama.

Burnham quotes from a Kellerun (Rayner’s species) classic, The Ballad of Krul, “Serve it without a grum of osikod.” From context it probably means not to sugarcoat whatever is said next, with “grum” as a quantity and “osikod” either as a flavoring ingredient, or a word meaning deception, i.e. “without an ounce of bullshit.”

Book makes reference to charging impulse capacitant cells and then releasing the energy into the drive coils. Impulse engines, although limited to sublight operations, have had warp driver coils as part of their design in various eras. In the 22nd Century, according to the USS Enterprise Haynes Manual, the NX-01 used the inertial mass-altering capabilities of a warp field to increase the apparent mass of ejected propellant to achieve greater thrust. In SNW: “Memento Mori”, there is a reference to only half impulse speed being achievable with one warp nacelle damaged. The TNG Technical Manual says that as of the mid-24th Century and the designing of the Ambassador-class, driver coils were built into impulse engines to lower the inertial mass of the ship so that even at sublight the ship would be easier to push.

Book is aware of the Mirror Universe, since he recognizes the ISS prefix (as opposed to USS) for Empire ships. And we see it is the ISS Enterprise, last seen in TOS: “Mirror, Mirror”.

Michael says that crossing between universes has been “impossible for centuries”. This is a stronger statement from from what Kovich said in DIS: “Die Trying”, when he stated that the MU and the Prime Universe had been drifting apart ever since Georgiou crossed over (back in the 23rd Century), and there hadn’t been a crossover between the two for 500 years. While it’s debated, I’m of the school of thought that Georgiou did cross universes (and time) during DIS: “Terra Firma” thanks to the Guardian of Forever. And in that same episode, Kovich related the tale of Yor, a Time Soldier, from the 2379 of the Kelvin Timeline to the 30th Century of the Prime Timeline.

Cardassian voles are rapidly breeding pests that are attracted to energy fields. They are native to Cardassia Prime and first mentioned in DS9, but have made appearances in ENT and also DIS Season 1. DS9 once suffered an infestation of voles.

A graviton pulse was used to seal up a subspace rupture in TNG: “Schisms”. While the idea is to use it to stop the antimatter reactions making the aperture pulse, the 43.7% chance of implosion sealing it forever makes sense with what it was used for in “Schisms”.

The bridge of the ISS Enterprise uses the same set as SNW, but with the Empire logos and a ISS dedication plaque as part of the redress. Michael wants to use the sensors to track quantum signatures from “our universe”. It was established in TNG: “Parallels” that every possible universe has a unique quantum signature as does its inhabitants.

Michael mentions her mirror counterpart and how she must have died before ISS Enterprise was trapped. The exact disposition of Mirror Michael is unclear. in DIS Season 1 she was lost in a shuttle accident and Prime Michael posed as her. In the licensed comic book Succession, (co-written by novel and series writer Kirsten Beyer) it was revealed that Mirror Michael had survived and managed to ascend to the throne, but she was in turn killed by Mirror Airiam. In DIS: “Terra Firma”, Mirror Michael finally makes an on-screen appearance. Mirror Georgiou and her fight and kill each other before Georgiou is returned to the 32nd Century, so it depends on whether you believe Georgiou was actually traveling in time or not or whether she was in the actual MU or not. In any event, Prime Michael is unaware of the events of the comic or Mirror Georgiou’s time/space travel.

Michael looks at her adoptive brother Spock’s station - or at least where it would be on the Prime Enterprise. Despite Michael’s assumption, Mirror Spock was not exactly “as ruthless as the rest”. As Prime Kirk described him in TOS: “Mirror, Mirror”, he was a man of integrity “in both universes”. Sadly, it would be Mirror Spock’s reforms towards peace that would lead to the Empire being toppled by a Klingon-Cardassian alliance.

The intermix chamber is where the matter/antimatter reaction of the warp core takes place. In TNG times, the entire warp core assembly consists of the intermix chamber plus the matter and antimatter injectors and tubes which is what is jettisoned when they order the warp core to be ejected (VOY: “Day of Honor”, et al.).

The plaque in the transporter room indicates Tartarus Base on Stardate 32336.6 - by TNG reckoning that would correspond with 2355, but who knows how the Terrans measured stardates? In any case, since they’re using the SNW sets, the ship itself is apparently showcasing mid-23rd Century levels of technology. Oddly, for a plaque apparently put up by dissidents, it says "Long Live The Empire". Tartarus Prime was mentioned as a planet with high temperatures in the novel The Rings of Time.

The Terran High Chancellor making reforms might be referring to Spock, who was said to have risen to be Commander-in-Chief of the Empire (DS9: “Crossover”). Mirror Saru was a Kelpien slave in the MU experienced by Georgiou in DIS: “Terra Firma” but was saved by her and consequently went on to save a lot of lives. If the plaque was put up in 2355, then these events would have taken place about 97 years after Mirror Saru was saved by Georgiou and about 88 years after Mirror Spock met Prime Kirk. We don't really know how long Kelpiens naturally live, but Su'Kal (the one who caused the Burn) lived to be over 120 years old, so it's possible.

Interestingly, there are holoemitters in Sickbay, which seem to indicate later-24th Century technology (i.e. the EMH of VOY). Of course, this is all assuming tech levels are consistent across universes. I have many questions.

An Erigah is a Breen blood bounty, and we have a fan theory confirmed: L’ak is indeed a member of the mysterious Breen that have never been seen unmasked on screen. In the Litverse, the Breen are actually a society rather than a single race, consisting of six species, none of whom match L’ak’s description.

In the flashback, the Breen Moll meets wear similar uniforms (although the helmets don’t have the pronounced “beak”) and speak the same unintelligible language from their appearances in DS9. The Breen also carry what must be a 32nd Century version of the neural truncheons they had in DS9, which acted like cattle prods.

Moll identifies L’ak as the “Primarch’s nephew”. Coincidentally, in DS9: “The Adversary” the leader of the Tzenkethi Coalition in the 24th Century is known as the “Autarch”.

When L’ak first removes his helmet, his skin and skull are almost transparent, reminding me of how the Gallamites were described with transparent skulls and brains twice the size of humans (DS9: “The Maquis, Part 1”). It seems that Breen skulls and skin get more opaque with exposure.

Callor V was previously mentioned in DIS: “Jinaal”. Rubindium is used in communications tech, first mentioned in TOS: “Patterns of Force” and subsequently in DIS: “Far from Home”. There is also a similar-sounding element called rubidium (VOY: “Think Tank”).

The Emerald Chain, an organized crime concern, was the central antagonist in Season 3, but are shattered by the end of it, so that dates the start of Moll and L’ak’s relationship to 3189.

Booker’s planet Kwejian was destroyed by the DMA in Season 4, in case anyone forgot, leaving him the last of his species.

The Primarch says L’ak carries the genetic code of the Yod-Thot, “They who Rule”. In DS9, “Thot” denoted a high rank (the script for DS9: “Strange Bedfellows” describes Thot Gor as a Breen general). As a side note, the Klingon word yoD means “shield”.

So Breen have “two faces”, one transparent and one not. Hopefully we can get some backstory to explain why this is, and why the non-transparent face is viewed with disdain. The weapon the Primarch materializes is a sleeker version of the 24th Century Breen rifle.

We see L’ak apparently bleeding, although the fluid isn’t red. In DS9: “In Purgatory’s Shadow”, Bashir says Breen don’t have blood, although how he knows this for sure is not explained. While this could be misinformation, some Earth invertebrates have circulatory systems that contain, not blood, but hemolymph, a fluid that carries carbohydrates, lipds, amino acides, hormones, etc. through the body. The Breen could be similar.

Rhys’s suggestion seems odd at first blush - don’t photon torpedoes already have antimatter in them? Then you realize his idea is to replace the matter in the torpedoes with antimatter as well, adding more antimatter to the aperture reactions. I’m still trying to figure out why hexagonal.

Michael comments that “hit it,” sounds weird and sticks with her own “let’s fly.” Of course, “hit it” was Pike’s catchphrase to go to warp.

I’m going to leave the question of how Stamets is able to recognize that it’s the ISS Enterprise from this distance unanswered. The setting and ending of the episode was kind of spoiled if you had paid attention to the Season 5 trailers anyway.

The face off between the ISS Enterprise and the refit Discovery reminds me of a similar face off between the USS Enterprise and Discovery at the end of Season 1 (DIS: “Will You Take My Hand?”).

Michael used the tractor beam earlier to signal 3-4-1-4, a reference to The Ballad of Krul Section 4, Verse 7 where Krul calls to his war brother for rescue with a drumbeat using that pattern.

I’m still kind of bummed we didn’t see any Tzenkethi despite being in their space. Which kind of makes me wonder what their status is in the 32nd Century.

Culber refers to his death and resurrection in Season 1 (DIS: “Despite Yourself” and “Saints of Imperfection”, respectively).

We find out that the MU refugees did make it to the PU, and one of them, Dr Cho, became a Branch Admiral in Starfleet. Presumably the trauma of existing in a different universe wasn’t as severe because there was no time travel involved, unlike Yor or Mirror Georgiou, who crossed universes and had a centuries-long gap.

The Branch Admiral rank was detailed in the FASA Star Trek RPG’s TNG Officer’s Manual, and was a new rank to extend Admiral’s rank and privileges to non-Command division positions like the Starfleet Surgeon General, or other divisions like Security or Engineering, or the Inspector General’s Office. This was to give them the requisite authority to carry out their policies.

Since Cho was a part of Jinaal’s group, which existed during the Dominion War (2373-2375), that makes the Starfleet. Presumably the trauma of existing in a different universe wasn’t as severe because there was no time travel involved, unlike Yor or Mirror Georgiouears old, assuming she was commissioned at the same time as her Prime counterpart, in 2245. Which leaves the question of why the tech is the same despite nearly a century apart up in the air, since they apparently added holoemitters. Maybe the show should have used the Enterprise-D sets from PIC Season 3. The Enterprise-D was commissioned between 2362 and 2364 (sources vary), so that’s actually a closer date.

The dedication at the end is to Allan Roy “Red” Marceta, who was a lead set dresser on DIS. He passed away in 2022.

The title comes from the David Bowie song “Changes” from the 1971 album Hunky Dory. The song also has the lyric “Time may change me, but I can’t trace Time.” Given the theme of this episode, it seems appropriate.

The latinum bars are soaked in fop’yano poison (first mention). Latinum, a Ferengi currency, is a metallic liquid which is encased in gold (considered by Ferengi to be worthless), and persists as a currency in the 32nd Century (last seen in DIS: “All In”). The dead weapons dealer is Annari, a Delta Quadrant species which first appeared in VOY: “Nightingale”.

Deuterium manifolds were mentioned in dialogue in VOY: “Course: Oblivion” and VOY: “Renaissance Man”, with deuterium being the fuel used in fusion reactors on Federation starships. A manifold distributes fluids and gas from one pipe to many and vice versa. In internal combustion engines, an intake manifold distributes the fuel-air mixture to the cylinders and an exhaust manifold distributes exhaust from multiple sources to a single pipe for venting.

Polarons are particles that can be used in weaponry (DS9: “The Jem’Hadar”) or for scanning for vessels (VOY: “State of Flux”), among other things. Polaron radiation is fatal to humanoids (DS9: “Apocalypse Rising”).

The Red Angel is indeed Michael, forming a major part of the plot for DIS Season 2. Michael and Rayner appear to have been transported to the end of Season 2, when Michael pulled Discovery along with her to the 32nd Century (between DIS: “Such Sweet Sorrow, Part 2” and “Far From Home”).

Michael identifies the second jump as being in drydock in San Francisco when Discovery was first being built. The original dedication plaque for the NCC-1701 says “San Francisco, Calif.”, so that tracks. The dedication plaques for Discovery, Shenzhou and Franklin also indicate they were launched from the San Francisco Fleet Yards. That being said, the assumption was always that the fleet yards were in orbit, the scene in ST 2009 showing the Enterprise being constructed on Earth notwithstanding.

The next jump is to Stardate 1051.8, the climax of Season 2 of DIS (“Such Sweet Sorrow, Part 2”), the Battle near Xahea with Control, just before the time of the first jump.

Rayner identifies the culprit: a Krenim chronophage or a “time bug”, left over from the Temporal War. The Krenim were Krenim were a Delta Quadrant species with the technology to manipulate time (VOY: “Year of Hell”). A chronophagey a “time eater”. The Temporal Cold War was a feature of ENT’s stories, which became a hot war around the time of the 31st Century (ENT: “Storm Front”), although the nature of a time war means that it was fought across different time periods. Eventually, as a result of the War, time travel was outlawed.

The time jumping into the past of the ship is very similar to the events of VOY: “Shattered”, as many have pointed out. In the VOY novel A Pocket Full of Lies by Kristen Beyer, it is revealed that the shattering of Voyager into 37 time frames was due to the detonation of a chroniton torpedo launched by the Krenim Beyer was hired as a staff writer for DIS and was an executive producer on PIC and SNW.

Stamets’ consciousness exists outside of the normal flow of time (DIS: “Magic to Make the Sanest Man Go Mad”) because of his tardigrade DNA, which he spliced into himself so he can function as the navigator required to use the Spore Drive (DIS: “Choose Your Pain”).

The fourth jump takes them to Osyraa’s hijack of Discovery in Season 3 (DIS: “Su’Kal”). The Black Alert was Tilly trying to jump away, but Stamets was interrupted before the jump could be executed by an Emerald Chain boarding party. Reno is dressed in Discovery’s 23rd Century uniforms, since this is before the crew changed to 32nd Century uniforms at the end of Season 3.

A Vesper martini is a cocktail invented by Ivar Bryce, a friend of writer Ian Fleming’s, who used it in Casino Royale, the first James Bond novel. It consists of gin, vodka and lillet.

The fifth jump takes them to 3218, 27 years in the future. Zora says that Michael and the crew died “decades ago” when the Progenitor tech fell into the wrong hands.

The Breen (DS9: “Strange Bedfellows”) are an antagonistic alien race usually hidden behind their masked suits. They were originally referred to as a Confederacy but in the 32nd Century are an Imperium. They have been mentioned previously as being in a state of infighting.

Michael refers to the first time she boarded Discovery while still serving her sentence for the mutiny she attempted on the Shenzhou in DIS: “The Vulcan Hello” that (debatably) set off the Klingon War.

The diagram that Zora flashes up is a light cone, used in physics as a way to visualize a path through spacetime, converging on the event where the past and future cones meet.

The tone of this future jump is similar to the Short Treks episode “Calypso”, where a future Discovery is seen devoid of life except for Zora, who has been alone for a thousand years. However, that version of the ship does not bear the NCC-1031-A number of the refit (as the episode was made before the Discovery’s time jump at the end of Season 2) and how “Calypso” can fit in with continuity as it stands now is a matter of debate.

Chronitons are Trek particles with temporal properties and associated with time travel. World lines are curves in spacetime describing the path an object takes through spacetime, and therefore its corresponding history. Scaravelli’s Constant is not a real thing as far as I can tell. Mark Rothko was an abstract painter known for his color field paintings.

Just as a note - the reason why Michael and Rayner are in their 32nd Century uniforms and Stamets is not is because the first two are physically jumping through time thanks to being in mid-transport when the jumps started. Stamets remembers only because his consciousness is the one that retains its memory despite the time jumps, as he did in “Magic to Make the Sanest Man Turn Mad”.

Book pronounces raktajino in its usual form, so Reno’s pronunciation of it as “raktachino” last episode must be idiosyncratic in nature.

The warp bubble does indeed insulate whatever’s within from the effects of Special Relativity - it has to, or else faster than light travel would be impossible. This is true whether or not you subscribe to the Alcubierre model for the warp drive (which I do not), the TNG Tech Manual version where the warp bubble lowers inertial mass (which I do), or some other method.

Rayner expresses concern that breaking the warp bubble would rip Discovery (and them) apart and Stamets says inertial dampeners will take care of that - which to me discounts Alcubierre once again because there are no inertial forces acting on the ship in such a model.

Airiam was Discovery’s cyborg spore drive ops officer who was taken over by Control and had to be killed (DIS: “Project Daedelus”).

Michael (and Michael) is presumably using Suus Mahna in the fight, a Vulcan martial art that T’Pol was also proficient in (ENT: “Marauders”). She finishes herself off with a Vulcan nerve pinch. Non-Vulcans have been known to use the nerve pinch, and Michael herself used it in “The Vulcan Hello” to disable Georgiou.