Star Trek:
The Mirror Universe Chronology

Compiled by Edgar Governo

"You're mistaking our universe for someone else's."
--Jonathan Archer, "In A Mirror, Darkly, Part II"

Although it's not set in the Mirror Universe, I'm pleased to announce that
my Star Trek: Enterprise short story "You Are Not in Space" appears
in the anthology Strange New Worlds 10 from Pocket Books,
available on both (even Amazon Kindle) and

This chronology is intended as a guide to the events depicted in the Mirror Universe, as well as its internal history, described from that universe's point-of-view. The format of the chronology is based more or less on that found in Star Trek Chronology: A History of the Future, by Michael Okuda and Denise Okuda. The individual episodes and the Star Trek universe as a whole are 2011 CBS Studios Inc, and this chronology is in no way affiliated with that company.

The only direct sources used in constructing this chronology were the eight episodes which have dealt with the Mirror Universe:

I am indebted to all of these writers, of course.

Under each entry, there is an explanation of how I arrived at the date in question. Many of the references to past events are explained using sources from "our" universe, arising from my presumption that events in the Mirror Universe tend to inherently reflect those in the universe we know, acting as a true "mirror" of sorts to normal Star Trek history. For our purposes, this refers mostly to events that we can confirm as occurring in both universes, such as the births of characters and their direct ancestors. This presumption is also one of convenience, since admittedly, evidence from the Mirror Universe episodes themselves is pretty scarce.

Although the format is based on the Okudas' work, the dates derive from various suppositions and assumptions I have made in constructing my Star Trek Chronology, Beta Version, which disagrees with them on a number of points, particularly concerning dates for The Original Series.* This is also not based in any way on "The Rise of the Empire: A Chronology of the 'Mirror' Universe" (The Best of Trek #14, 1988), although I am grateful to Jody A. Morse for providing a good read.

A Note on "Alternate" Alternate Universes

The comic book story "New Frontiers" by Mike W. Barr (DC Comics, Volume 1 Issues #9-16, December 1984-July 1985, published in graphic novel form as The Mirror Universe Saga in 1992 and again as Star Trek Archives Volume 6: Best of Alternate Universes in 2009); the novel Dark Mirror by Diane Duane (Pocket Books, 1993); and the novels Spectre, Dark Victory, and Preserver by William Shatner (Pocket Books, 1998-2000) are also Mirror Universe tales, but their depictions of that universe are not consistent with the later Deep Space Nine episodes or with each other. If one wants to believe that these still took place in "our" universe (and I see no reason why not), the Mirror Universes within can be explained as alternate timelines, with Spock as the focal point. (Spock's "consideration" is mentioned in all three versions.)

If you want a canonical justification for this approach, just watch the episode "Parallels" again....

It is possible, on the other hand, that the following titles are entirely consistent with the aired episodes in question, since the authors would have had most or all of them to draw upon:

More recently, multiple books released primarly by various imprints of Simon & Schuster have developed a single interconnected continuity, including the following titles related to the Mirror Universe:

However, I have not had the chance to actually read all of these books yet to see if this is the case. Provided that some or all of them do prove to be consistent, they may be included in a future revision of this chronology.

Should you dispute any of the dates in this chronology, or you want to provide your own speculations, feel free to contact me with your thoughts. You can find many more fictional timelines at The History of Things That Never Were.


April 23

William Shakespeare is born to John Shakespeare and Mary Arden. His plays will later be considered grim, with characters who are neither weak nor compassionate.

[Historical accounts. This specific date is traditionally accepted for Shakespeare's birth, though it is only known for certain that he was baptised on April 26. In "In A Mirror, Darkly, Part II," Phlox tells T'Pol that "(Shakespeare's) plays were equally grim in both universes," but not all of "our" Shakespeare's plays were grim, suggesting that Phlox may have been looking at the histories and tragedies as opposed to the comedies. Given his description, however, one wonders what the latter are like in the Mirror Universe...]


The HMS Enterprize, a captured sixth-rate frigate, is the first vessel to bear the name.

[Historical accounts. The opening credits sequence for "In A Mirror, Darkly" shows the same engraving of this sailing ship used in the regular opening credits for Star Trek: Enterprise. In "our" universe, this was originally the French Navy ship l'Entreprise, but it is unknown whether this Enterprize had a similar history. The prefix "HMS" implies the existence of a Royal Navy and, by extension, a British Empire, but this cannot be confirmed.]


October 5

Robert Hutchings Goddard is born to Nahum Danford Goddard and Fannie Louise Hoyt.

[Historical accounts. The opening credits sequence for "In A Mirror, Darkly" shows the same footage of Goddard writing on a chalkboard used in the regular opening credits for Star Trek: Enterprise, suggesting that his Mirror Universe counterpart played a similar role in the history of rocketry.]


The Junkers Ju 87 dive bomber, also known as the Stuka (Sturzkampfflugzeug), goes into production.

[Historical accounts. The opening credits sequence for "In A Mirror, Darkly" shows several of these aircraft in flight.]

Before 1955

The Terran Empire is established.

["In A Mirror, Darkly, Part II." Archer states that the Empire "has endured for centuries," making it at least this old. The precise circumstances of the Empire's creation are unknown.]


The 2K12 Kub mobile surface-to-air missile system, also known by the designation SA-6, goes into production.

[Historical accounts. The opening credits sequence for "In A Mirror, Darkly" shows footage of this missile system.]

November 9

The first Saturn V multistage rocket is launched.

[Historical accounts. The opening credits sequence for "In A Mirror, Darkly" shows footage of this model of rocket. This specific date marked the launch of Apollo 4, but although the same opening credits depict a moon landing under the auspices of the Terran Empire, it is unknown whether the Mirror Universe's Saturn V was also developed for its version of the Apollo program.]


The F-5E Tiger II light tactical fighter officially goes into production.

[Historical accounts. The opening credits sequence for "In A Mirror, Darkly" shows footage of this aircraft.]


The F-15 Eagle air superiority fighter officially goes into production.

[Historical accounts. The opening credits sequence for "In A Mirror, Darkly" shows footage of this aircraft.]


The first Project 705 Lyra submarine, also known as the Alfa-class attack submarine, is commissioned.

[Historical accounts. The opening credits sequence for "In A Mirror, Darkly" shows footage from The Hunt for Red October of the V.K. Konovalov, a fictional submarine of this class.]


The B-1B Lancer strategic bomber officially goes into production.

[Historical accounts. The opening credits sequence for "In A Mirror, Darkly" shows footage of this aircraft.]


The T-90 main battle tank goes into production.

[Historical accounts. The opening credits sequence for "In A Mirror, Darkly" shows footage of this armoured fighting vehicle. In normal Star Trek history, this year would be in the midst of the Eugenics Wars, but it is unknown whether the Mirror Universe experienced its own version of this conflict.]


Dax is born.

["You Are Cordially Invited" (DS9). Jadzia describes her symbiont as being 356 years old. One could assume that, since Dax was eventually joined with Jadzia, the previous succession of hosts was also the same as in "our" universe.]


Zefram Cochrane is born.

["Metamorphosis" (TOS). Cochrane disappeared 150 years before this episode at the age of 87. Although this is a second-season episode of The Original Series, its star date places it alongside other episodes from the first season.]


April 5

The Vulcan ship T'plana-Hath lands in Bozeman, Montana (possibly as part of an invasion force). Zefram Cochrane turns the tables on them by using his shotgun to kill the first Vulcan who steps onto Terran soil when the Vulcan goes to greet him. The gathered mob of humans then boards the Vulcan ship.

["In A Mirror, Darkly." The date, place, and events themselves are shown onscreen. The name of the ship is based on the suggestion by Ronald D. Moore, co-writer of Star Trek: First Contact, that this was the name of the ship which landed in "our" version of this incident, as seen in that film. It is not clear whether Archer was being historically accurate or simply hateful and paranoid in later calling this an "invasion force" when talking to T'Pol.]


T'Pol is born to T'Les. Her second foremother is T'Mir.

["Zero Hour" (ENT). T'Pol tells Trip that she will be 66 years old on her next birthday. T'Les was introduced in "Home" (ENT), while T'Mir was introduced in "Carbon Creek" (ENT).]


Malcolm Reed is born to Stuart and Mary Reed.

[Conjecture based on the age of actor Dominic Keating. Malcolm's parents are introduced in "Silent Enemy" (ENT).]


Travis Mayweather is born to Rianna Mayweather.

["Dead Stop" (ENT). Phlox states that Travis is twenty-six. Travis's mother is introduced in "Horizon" (ENT).]


July 9

Hoshi Sato is born, the second child in a family of three. Her paternal grandfather is Michio Sato.

["In A Mirror, Darkly, Part II." A biographical screen for "our" Hoshi Sato called up by Archer aboard the Defiant gives this as her date of birth. Michio Sato is mentioned by Hoshi in "Exile" (ENT).]


The Terran flagship ISS Enterprise (NX-01) leaves Spacedock. Although the ship could have been Jonathan Archer's, Starfleet admirals conspire behind his back, ultimately giving command to Captain Maximilian Forrest, with Commander Archer as his first officer.

["In A Mirror, Darkly." Hoshi talks about these events with Archer, and Archer later describes it as the Terran flagship. The prefix "ISS" can be seen on the ship's hull, and the registry number can be seen on the ship's mission patch, while the date is based on when "our" Enterprise was launched, as seen in "Broken Bow" (ENT). It is unknown whether this Enterprise was involved in some version of the Temporal Cold War earlier in its mission, but Archer indicates that the ship is in possession of a Suliban cloaking device. Forrest's first name is not given in the episode itself, but writer Mike Sussman indicated in its podcast commentary that he "modified his first name in the script," as "our" Forrest's first name is Maxwell.]

Admiral Black recommends Charles Tucker III for chief engineer, and insists Captain Forrest replace his own man with Tucker.

["In A Mirror, Darkly." Archer tells Tucker that he checked the records and learned this, in the midst of torturing Tucker in the agonizer booth.]


The Tholians detonate a tricobalt warhead inside the gravity well of a dead star. The explosion creates an interphasic rift, providing a doorway into a parallel universe, but the rift is unstable. It is too dangerous for the Tholians to send one of their own ships through, so they transmit a distress call into the opening, hoping to lure a ship from the other side. Their plan appears to work brilliantly, as the starship USS Defiant (NCC-1764) from that universe is drawn into the rift.

["In A Mirror, Darkly." Archer describes what happened during his briefing of the senior officers on Enterprise. These events would've taken place relatively recently, but long enough ago for the Tholians to bring the Defiant to their own dock and for Archer to find out about the ship.]

The Tholians quantum-date a piece of the hull from the USS Defiant, discovering that the ship is not only from another universe, but from another time--about a hundred years into the future.

["In A Mirror, Darkly." Archer also tells this to the senior officers, explaining his motivation for wanting to get at the ship in the first place.]

Jonathan Archer buys off one of the humanoids working as an outside labourer for the Tholians. This contact provides Archer with information on the Tholians' activities and transmits images of the docked USS Defiant before his signal is jammed.

["In A Mirror, Darkly." When Hoshi asks how Archer knows what the Tholians are up to, he gives this answer.]

There is a battle at Tau Ceti, part of an ongoing war. Things go very badly for the Terran Empire, with Starfleet losing twelve ships, but Imperial propaganda conveys the message that the battle went well and that the war may be over soon.

["In A Mirror, Darkly." Captain Forrest dissuades Hoshi of the mistaken notions she has gathered. The episode suggests that this war involves the Terran Empire fighting off a rebellion, but few details are provided. It is also unclear how Forrest could have been involved in this battle if Enterprise and its crew have only heard about it.]


Enterprise leaves Gorlan Station and sets a course to rendez-vous with their assault fleet.

[Just before "In A Mirror, Darkly." Captain Forrest mentions this in his Star Log.]

January 13

"In A Mirror, Darkly"

[The date for this episode is given by Captain Forrest in his Star Log.]

January 18

"In A Mirror, Darkly, Part II"

[The date for this episode is given by Archer in his Defiant Star Log.]


Sarek of Vulcan is born to Skon, son of Solkar.

["Journey to Babel" (TOS). Sarek states that he is precisely 102.437 years old at the time of this second-season episode of The Original Series, placing his birthdate late in this year. There must be a Mirror Universe version of Sarek because there is a Mirror Universe version of Spock. Sarek's father and grandfather are named in Star Trek III: The Search for Spock.]


Spock is born to Sarek of Vulcan and Amanda Grayson.

[This is one of the few dates in this chronology that is based primarily on evidence from a novel, as Spock is shown to be seven years older than McCoy in The Final Reflection by John M. Ford (Pocket Books, 1984). There is no particular hard evidence in the aired canon to dispute this, and I always considered the Okudas' use of Leonard Nimoy's age to determine Spock's birthdate somewhat arbitrary, especially considering how long-lived Vulcans are.]


Montgomery Scott is born.

["Relics" (TNG). Doctor Crusher describes Scotty as a man of 147.]


Leonard H. McCoy is born, the son of David McCoy.

["Encounter at Farpoint" (TNG). Data describes Admiral McCoy as being 137 years old.]


James Tiberius Kirk is born to George Kirk, son of Tiberius Kirk, and Winona Kirk.

["The Deadly Years" (TOS). Kirk states that he is thirty-four. The names of Kirk's parents and paternal grandfather are canonically established in the feature film Star Trek.]


The starship ISS Enterprise (NCC-1701) is commissioned.

[Based on the commissioning date for "our" Enterprise as given in the Star Trek: The Next Generation Technical Manual and elsewhere.]


Pavel Andreievich Chekov is born.

["Who Mourns for Adonais?" (TOS). Chekov states that he is twenty-two.]


Tuvok is born to T'Meni.

["Flashback" (VGR). Tuvok indicates he was twenty-nine during the events of Star Trek VI: The Undiscovered Country, which takes place in 2293. T'Meni's name is given in "Hunters" (VOY), when Tuvok indicates that his granddaughter was named after her.]

2265 to 2270

James T. Kirk plunders the laboratory of an unknown alien scientist and obtains the Tantalus Field, capable of wiping someone out of existence by the touch of a button. Kirk will use it in his rise to power, disposing of his enemies by making them simply "disappear."

["Mirror, Mirror." Marlena Moreau describes this device and its abilities, saying that "the great, powerful Captain Kirk...owes everything" to it. Although it is possible Kirk obtained the Tantalus Field earlier, he apparently used it to initially gain control of the Enterprise, so it seemed appropriate to place this event here.]

Kirk succeeds to command of the ISS Enterprise through the assassination of Captain Christopher Pike. His first action as captain is the suppression of the Gorlan uprising through the destruction of the rebel home planet. His second action is the execution of five thousand colonists on Vega IX.

["Mirror, Mirror." The Enterprise computer reads out the official record of the ship's current command (or at least begins to) at the request of "our" Kirk. Marlena later says that the Tantalus Field "made (Kirk) captain," implying that he used it to assassinate Pike. Nothing else is known of this Captain Pike--but if events reflected those in "our" universe, Spock would have served under him, and he would have gained command by assassinating Captain Robert April.]


Star Date 4428.9

"Mirror, Mirror"

[The episode occurs in this year because it is a second-season episode of The Original Series. Intendant Kira also tells her counterpart from "our" universe in "Crossover" that the events of this episode happened "(a)lmost a century ago." Admittedly, the star date is derived from the novel Dark Mirror, despite the fact that I do not consider its events canonical in this chronology, because there is no star date given in the episode itself (or anywhere else).]

Afraid that others might come from the alternate universe to interfere in the affairs of this one, it is decided that if it ever happens again, anyone who appears from the other side will be promptly disposed of. All transporters are also redesigned to make sure the same sort of accident responsible for the first crossover will never happen again.

["Crossover." Intendant Kira tells her counterpart from "our" universe about "a certain protocol" she is supposed to follow, and later explains how using a transporter to get back will not work (a fact belied somewhat by later episodes). It is interesting that the Intendant identifies with these decisions, since they presumably would've been made by the Terran Empire.]


Star Date 5693.2

"The Tholian Web"

[The episode occurs in this year because it is a third-season episode of The Original Series, while the star date is given in the episode itself. Commander Archer also tells the senior officers on Enterprise in "In A Mirror, Darkly" that the USS Defiant, which disappears in this episode, is from "about a hundred years into the future." Although for all intents and purposes, this episode takes place entirely in "our" universe, its events tie in very closely to those of "In A Mirror, Darkly," so it seemed fitting to include it here anyway.]

2273 to 2329

Spock, profoundly influenced by the words of the alternate Captain Kirk, rises to Commander-in-Chief of the Terran Empire by preaching reforms, disarmament, and peace. This represents quite a remarkable turnabout for his people.

["Crossover." Intendant Kira describes the aftermath of the first crossover to her counterpart from "our" universe. Her description suggests that Vulcans were perhaps particularly known for their brutality during this period, or that they simply lacked power before this.]

When Spock has completed all his reforms, his Terran Empire is no longer in any position to defend itself against the historic coming together of the Klingons and the Cardassians. The Klingon/Cardassian Alliance completely takes over the Empire and begins enslaving Terrans.

["Crossover." Intendant Kira explains how unprepared the Empire was to her counterpart from "our" universe.]

Bajor, having been under Terran occupation for decades, is freed by the Alliance. The planet petitions for entry into the Alliance and is accepted, eventually becoming quite an influential power within it.

["Crossover." Intendant Kira explains Bajor's position in the Alliance to her counterpart from "our" universe. The degree to which Bajor was really "freed" by this is debatable, but I'm sure it seems that way to the Intendant.]


Bareil Antos is born on Bajor.

[Conjecture based on the age of actor Philip Anglim. I realise my earlier comments about the use of Leonard Nimoy's age make my use of Anglim's age somewhat hypocritical on my part, but Bajorans are much more similar to humans in their aging process, and I didn't have any other source to draw upon.]


Worf, son of Mogh, is born. His grandfather is also named Worf.

["Sins of the Father" (TNG), as well as several other episodes, establish that "our" Worf was six years old at the time of the Khitomer Massacre in 2346. Colonel Worf, a character also played by actor Michael Dorn in Star Trek VI: The Undiscovered Country, was established by promotional materials for that film as Worf's grandfather.]


Julian Subatoi Bashir is born to Richard and Amsha Bashir.

["Distant Voices" (DS9). Bashir is celebrating his 30th birthday in that episode, which takes place in 2371. Although Bashir is described as twenty-seven in "Emissary" (DS9), which takes place in 2369, I assume that said episode merely takes place before his 28th birthday. It is unknown whether this Bashir was also genetically enhanced by his parents as a child, as first established in "Doctor Bashir, I Presume" (DS9), which also introduced Bashir's parents.]


Kira Nerys is born on Bajor to Kira Taban and Kira Meru.

["Wrongs Darker Than Death or Night" (DS9) establishes that "our" Kira was three years old in 2346 and introduces Kira's mother. Kira's father is first seen in "Ties of Blood and Water" (DS9).]


Star Date 47833.4


[In the absence of evidence to the contrary, episodes are assumed to take place two weeks after the episode preceding it. The star date is derived by counting forward from the last Deep Space Nine episode to have a given star date before this one, "Shadowplay." Although "Crossover" occurs seven episodes later, a two-part episode, "The Maquis," falls in the interim, suggesting that this episode actually occurs twelve weeks after "Shadowplay."]


Star Date 48696.6

"Through the Looking Glass"

[The star date is derived by counting forward from the last Deep Space Nine episode to have a given star date before this one, "Destiny," which occurred four episodes ago.]


Star Date 49741.8

"Shattered Mirror"

[The star date is derived by counting forward from the last Deep Space Nine episode to have a given star date before this one, "Rules of Engagement," which occurred two episodes ago.]


Star Date 51285.9


[The star date is derived by counting forward from the previous Deep Space Nine episode, "You Are Cordially Invited," which had a given star date.]


Star Date 52730.1

"The Emperor's New Cloak"

[The star date is derived through a series of conjectures used to organise the events of the seventh season of Deep Space Nine. Closer examination of that season may reveal that a different star date would be more appropriate.]

* "Space Seed," a first-season episode of The Original Series, takes place fifteen years before Star Trek II: The Wrath of Khan, which is set in 2285. While I agree with the Okudas' use of this date for the movie, I do not understand why they ignored their own rules regarding references to the passage of time in this instance, favouring a somewhat arbitrary placement of The Original Series instead. My own dates for The Original Series derive from this reference, as well as a policy of treating its episodes as occurring in star date order, and placing each season in the same calendar year (to the extent that that is possible in conjunction with the star date policy).

Crossed over April 8, 2005.
Last reflected September 10, 2011.
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