The Mirror Universe (MU) is a fictional parallel universe in which the plots of several Star Trek television episodes take place. It is named for "Mirror, Mirror", the original series episode in which it first appeared.
The characters in the Mirror Universe are generally the same as the characters in "normal" Star Trek continuity (for example, it has a James T. Kirk and a Spock), but their personalities are, on the whole, much more aggressive, mistrustful, and opportunistic. Whereas the Star Trek universe usually depicts an optimistic future which values peace and understanding, episodes set in the Mirror Universe show it to be marred by continual warfare, and compassion is seen as a liability. Uniforms are often more suggestive, such as women baring midriffs.
Though the Mirror Universe is much darker and more violent than the normal Star Trek universe, a few Mirror characters are more friendly or docile than their "normal universe" counterparts. For example, Mirror Quark puts himself at risk to help escaped slaves reach freedom, and while "normal" Brunt is selfish and power-hungry, Mirror Brunt is a kind and considerate Ferengi.
There are an infinite number of parallel universes in Star Trek canon (as witnessed in the Star Trek: The Next Generation episode "Parallels"). However, the Mirror Universe is prominent among dimension-crossing incidents. The Mirror Universe has been visited in one episode of Star Trek, five episodes of Star Trek: Deep Space Nine, and two episodes of Star Trek: Enterprise, as well as in several Star Trek novels and several of the games (Star Trek: Shattered Universe, for example, takes place entirely in the Mirror Universe).
Not all "normal" characters have a Mirror counterpart; because the Mirror versions of Ben and Jennifer Sisko separated before conceiving a child, there is no Mirror version of Jake Sisko. Several licensed works also indicate that since humans (or Terrans as they are called in the Mirror Universe) were largely enslaved by the time period of The Next Generation, a mirror universe copy of Data was never created. Also, since the Dax symbiont was never joined with Ezri Tigan, there is no exact copy of Ezri Dax in the Mirror Universe, only "Mirror" Ezri Tigan. Several Mirror Universe versions of established characters have also died during the course of the various canonical and non-canonical Mirror Universe storylines, whereas their "normal universe" counterparts remain alive. The reverse is also true with Bareil Antos being alive in the Mirror Universe when his "normal universe" counterpart had died, and with Jennifer Sisko, who survived for many years after her "normal universe" counterpart died. (The Mirror Sisko eventually died herself in the episode "Shattered Mirror".)
Characters from each universe refer to the other as "parallel" or "alternate" rather than as "mirror".
A two-part episode of Star Trek: Enterprise, entitled "In a Mirror, Darkly", introduces the early developments of the Mirror Universe.
On April 5, 2063, Zefram Cochrane conducted his warp flight, drawing the attention of a passing Vulcan ship, as per the events shown in the standard Star Trek universe in Star Trek: First Contact. When the Vulcans landed and made their peaceful introduction, however, Cochrane killed the leader with a concealed weapon, then led the townspeople in commandeering the Vulcan ship. The Vulcan ship is said to have been the vanguard of an invasion fleet, though it may have just been spun as such by propaganda, which is shown to be a common occurrence.
The special opening credits sequence used for "In a Mirror, Darkly" chronicles the history of human warfare and the interstellar domination of the Terran Empire, as opposed to the regular opening sequence depicting peaceful exploration. One of the more notable scenes is a Terran Empire flag being planted on the moon, which may or may not be intended to be in 1969. (The spacesuit being worn is the same as that which the Enterprise crew wears, but commentary on the episodes by their producers indicates that this was simply a matter of convenience, as the CGI model for that suit had already been created.)
Terran domination was made possible by technology taken from the Vulcans and (presumably) from other defeated races; thus, the Starfleet of the Mirror Universe was somewhat more advanced than its regular counterpart. By 2155, the Terran Empire had already enslaved the Vulcans, Andorians, Orions, and Tellarites, and launched successful attacks against the Klingons and the Xindi (as seen in the opening credits). As such, the Mirror Universe crew of Enterprise, known as the ISS Enterprise, is more racially diverse than its "real" universe counterpart, with Vulcans and Tellarites serving as crewmembers. The Mirror version of T'Pol, in particular, holds a position of trusted authority, and as in the "real" universe, a Denobulan, Phlox, serves as Enterprise's physician. The Mirror version of Soval is seen to be an enlisted science crewman aboard the ISS Avenger, another Starfleet vessel which is also seen to include Andorian and Orion crewmembers.
During the episode's stated date of January 2155, Archer steals the USS Defiant, an Original Series-era Constitution-class starship which disappears and is presumed destroyed in the Original Series episode "The Tholian Web", from the Tholians (who are more aggressive than their non-Mirror counterparts), but he is later poisoned by Hoshi Sato, who subsequently declares herself Empress of the Terran Empire (though whether she succeeds in this gambit is not revealed). During the episode, future events are foreshadowed, such as the fall of the Terran Empire after several centuries (as seen in the Deep Space Nine storyline described below).
The episode's story was continued in a novel mini-series Star Trek: Mirror Universe.
The existence of alternate realities was first established in the original Star Trek series episode "The Alternative Factor". In this episode, the crew encounter a man named Lazarus who appeared to undergo extreme shifts in behavior. After a time, it was discovered that there were two men, one from an alternative antimatter universe who was calm and rational, and another from our universe who was irrational. Both men had a ship that had the ability to send people into the other's universe. The Lazarus from the alternative reality said that there was a corridor of sorts between the universes where he and his counterpart could safely meet. If they met outside the corridor, both universes would be annihilated due to the contact between matter and anti-matter. Lazarus arranged with Captain Kirk to trap both him and the other Lazarus in the corridor forever by having Kirk destroy the ship, and at the same time, the ship in the other universe was destroyed as well. Both men were trapped forever in the corridor, one sane, and one not.
The Mirror Universe was first introduced in the original Star Trek episode "Mirror, Mirror". It was established that in the Mirror Universe the United Federation of Planets counterpart was the brutal Terran Empire, run by humans and their Vulcan allies. In the Mirror Universe, the term "Terran" is predominantly used for humans. The Mirror-Captain Kirk of the Imperial Starship Enterprise was a mass-murderer, who had been promoted to Captain by assassinating Captain Christopher Pike.
In the Terran Empire, officers were promoted for assassinating their superiors and order was kept by use of the "Agonizer" pain-giving devices. In some serious cases, the "Agony Booth" could also be used. Aesthetic differences included: the Mirror-crew's uniforms were flamboyant and somewhat robe-like, with ceremonial daggers for the officers; Mirror-Sulu was a Gestapo-like political officer with a disfiguring facial scar; Mirror-Spock had a goatee (which has led to a number of pop culture references of people from "evil alternate universes" having goatees), whereas the regular character does not; the "United Nations" emblem of the Federation was replaced in the Terran Empire symbol, which was a vertical sword of conquest savagely thrust through the Earth.
In this original encounter, Captain Kirk, Dr. McCoy, Lieutenant Uhura, and Chief Engineer Scott had been turned down by the peaceful Halkans, who did not want to trade for dilithium. They feared the use of the material for war. An ion storm causes a beam-up to go awry, switching the crew with their alternates.
Kirk tries to save the alternate-Halkans from destruction; the common tactic used by the Terran Empire when meeting resistance. He suffers several assassination attempts.
Both Spocks find out the dual nature of the affected officers and work on a way to get them home in time; there is a limit.
Before leaving the Mirror Universe, Kirk gave an impassioned speech in which he told Mirror-Spock that because the Empire would die in a few hundred years, that it was illogical, and Mirror-Spock was illogical for supporting the Empire. He asks Mirror-Spock to work for change, and Mirror-Spock replied that he would consider Kirk's proposal.
About a year after his first crossover, Kirk unknowingly experienced a second encounter with the mirror universe. In "The Tholian Web", the Enterprise encounters the crippled Constitution-class U.S.S. Defiant, which is phasing in and out of existence with Kirk's reality as a result of a localized spatial anomaly. Kirk leads an away team and discovers the crew is dead as a result of the anomaly's effect on the brain. As the Defiant begins to shift out of reality, the away team is beamed out, but Kirk is somehow trapped in the interphase. The Tholians claim this particular area of space and attempt to ensnare the Enterprise in their energy web, but the Enterprise, under the command of Spock, is able to escape and retrieve Kirk from between dimensions. Kirk remarks that during his experience the Defiant was pulled away into another dimension.
What Kirk never knew, but which was established in the Enterprise episode "In a Mirror, Darkly", was the Tholians of the Mirror Universe managed to open a dimensional rift hoping to steal technology from alternate realities. Their efforts also created a temporal rift, connecting from a universe 110 years in Kirk's past. The mirror Tholians sent out a distress call to lure a spacecraft and ensnared the Defiant in their trap, eventually pulling it completely into the mirror universe. So determined were the Tholians to unlock the technological secrets of the future ship that work crews began dismantling the ship before moving the bodies of the crew, several of whom were discovered by the ISS Enterprise away team in the same positions as Kirk had found them.
As a side note, the Tholian tactic of stealing future technology was paralleled in the regular Trek universe. In "Future Tense", 22nd century Tholians attempt to capture a 31st century Federation vessel but are thwarted by Archer's Enterprise.
The Mirror Universe was later revisited in the Deep Space Nine second-season episode "Crossover", and turned into a story-arc that spanned into the final season, with roughly one Mirror Universe episode a season.
On Deep Space Nine, which takes place over 100 years after the original contact with the Mirror Universe, it was revealed that drastic changes had occurred in the Mirror Universe because of the interference of the regular universe's Kirk. Before he left the Mirror Universe, James T. Kirk planted seeds of doubt in the Mirror-Spock's mind about the Terran Empire's brutal tactics. Kirk noted that Spock was a man of honor in both universes, and the Mirror-Spock listened to Kirk's urging for reform. Mirror-Spock's future role on Enterprise and the fate of Mirror-Kirk are unclear, though some have suggested that Mirror-Kirk was assassinated (and was shown in a non-canon Star Trek comic). Mirror-Spock then went on to become Chief of State of the Terran Empire. Mirror-Spock introduced many popular reforms that largely ended the iron-fisted rule of the Terran Empire, especially a vast demilitarization program. However, these reforms were very ill-timed.
Not long after Mirror-Spock's demilitarization drive, the Terran Empire encountered the Alliance. In the Mirror Universe, the Alliance is a unified government of the Klingons and the Cardassians, presumably ruled by the Klingon Emperor. The Alliance conquered the ill-prepared Terran Empire and enslaved the Terrans and Vulcans. Terrans became pariahs and a slave race, often subjected to mass forced physical labor.
The Alliance does not have cloaking device technology (although a ship was seen decloaking in an earlier episode, an episode in the seventh season established that the Mirror Universe does not have cloaking devices, and the earlier appearance was retconned out as a graphical error). However, cloak technology did exist in the 22nd century on at least one Terran ship (who in turn took it from the Suliban).
It is unknown what role the Romulans play in the Mirror Universe. However, there is evidence of their existence. When Sisko was finished impersonating Mirror-Sisko, he told Mirror-Jennifer Sisko that he was leaving to see the Romulans, to get them to join the fight against the Alliance. This implies that the Romulans are an independent empire, much like they are in the "prime" reality or universe. It also means that, unlike other races such as the Vulcans and Andorians, the Romulans were able to resist the Terran Empire and to survive the mirror equivalent of the Earth-Romulan War, assuming that one took place to begin with.
The Bajorans of the Mirror Universe were ruled by the Terran Empire but later sided with the Alliance and became masters of Terran slave forces. Notable among them was Intendant Kira, the counterpart to the normal universe's Kira Nerys. Intendant Kira was a ruthless, sadistic hedonist; she was outwardly bisexual and sexually aggressive — characteristics apparently more common in Mirror Universe females than in normal universe ones. She maintained power in her sector of the Alliance from Terok Nor, the counterpart of Deep Space Nine.
When Deep Space Nine officers Julian Bashir and Kira Nerys visited the Mirror Universe, they sparked a rebellion among the Terran slaves led by the Mirror-Sisko and Mirror-O'Brien. Over the next five years, the Terran Rebellion would drag on and was not conclusively finished. However, Regent Worf was eventually taken as a prisoner of war by the rebellion.
The Klingon Empire of the normal Star Trek universe hasn't actually had an Emperor in 300 years; they were replaced by the Chancellor and the High Council. But in the Mirror-Klingon Empire there are still ruling Emperors. The Mirror-Imperial Family is House Duras, who were deposed in disgrace in the normal Trek universe. However, during Deep Space Nine, a Regent currently ruled as the true power behind the throne: the brutal Regent Worf.
Other characters in the Mirror Universe:
Eventually, the Terran Resistance captured Mirror-Terok Nor and used it as a base of operations, and built a Mirror-Defiant using plans stolen from the normal universe.
The following is a list of episodes that take place in the Mirror Universe or involve characters from the Mirror Universe, in chronological order.
|ENT||418||"In a Mirror, Darkly"||Mirror-Archer, Mirror-Forrest, and the rest of the crew discover that a ship from 100 years in the future in an alternate universe, the U.S.S. Defiant, has travelled to their universe through some kind of rip in space. All of the crew members except Captain Forrest evacuate the I.S.S. Enterprise as it is attacked by Tholians and board the Defiant. The Enterprise is destroyed, and its surviving crew uses the improved technology of the Defiant to chase away the Tholians. Archer replaces Forrest as captain.|
|ENT||419||"In a Mirror, Darkly Part II"||The Mirror Enterprise crew find the Defiant littered with the corpses of its former crew who murdered each other due to the effects of Interphase which causes humans to become psychotic. The Tholians use slaves to strip the ship. The overseer is a Gorn named Slar, who sabotages the Defiant and kills some of the survivors of the ISS Enterprise . Mirror Archer defeats the Gorn, and then his thoughts turn to using the powerful Defiant to take control of the Terran Empire. However, it is Mirror-Hoshi Sato who ultimately threatens to use the Defiant's weapons on the Emperor of the Terran Empire and replace him as Empress of the Empire.|
|TOS||204||"Mirror, Mirror"||Four crew members from the USS Enterprise switch places with their mirror universe counterparts and must get home while avoiding being discovered by the mirror universe crew of the Enterprise.|
|TOS||309||"The Tholian Web"||The USS Defiant (NCC-1764) is trapped in Interphase in Tholian Space and vanishes. Note: Until "In a Mirror, Darkly" there was no obvious connection between this episode and the Mirror Universe. No elements from the Mirror Universe are shown or mentioned anywhere in this episode.|
|DS9||223||"Crossover"||Dr. Bashir and Major Kira are transported to the Mirror Universe 100 years after the events of "Mirror, Mirror". They find that the Terran Empire has been replaced by the Alliance of Klingons, Cardassians, and Bajorans and that humans are slaves.|
|DS9||319||"Through the Looking Glass"||The Mirror-O'Brien kidnaps Sisko where Sisko must impersonate his late counterpart in order to save the mirror version of his late wife.|
|DS9||420||"Shattered Mirror"||After the Mirror-Jennifer Sisko kidnaps Jake, Captain Sisko must travel to the Mirror Universe to retrieve his son. While there the Mirror-O'Brien wishes for Sisko to help him prepare their version of the Defiant for battle against the Alliance in what could mean freedom for the Terrans.|
|DS9||608||"Resurrection"||The Mirror version of Vedek Bareil arrives on DS9 as he flees from the Alliance. His real reason for being in our universe is to steal the Bajoran Orb of Prophecy and Change for the Intendant, the mirror Kira. However, before he can complete this mission, he has a change of conscience, convinced by Kira, leaving the Orb behind and returning to the Mirror Universe with the Intendant.|
|DS9||712||"The Emperor's New Cloak"||Grand Nagus Zek, financial leader of the Ferengi Alliance, is captured and taken to the Mirror Universe as a hostage. Quark and Rom must pay a ransom of a cloaking device to free Zek, but Regent Worf imprisons them all in his quest to crush the Terran rebels.|
The Mirror Universe was first established in the episode "Mirror, Mirror", following this there were no further canon visits until the Deep Space Nine episode "Crossover", DS9 continued to explore the Mirror Universe in several episodes and some years later the series Enterprise also explored the Mirror Universe in "In a Mirror, Darkly". Between these various canon productions the mirror universe was the basis of many novels and comics, however as each TV series made its own mark on the continuity of the Mirror Universe the histories and futures established for the universe in non-canon works began to contradict canon. Most recently several Mirror Universe novels have been published in the DS9 Relaunch series and the Star Trek: Mirror Universe series which integrate new non-canon stories into the complete canon Mirror Universe.
In 2007, two collections of Mirror stories were published: the first involves Mirror Enterprise, TOS and TNG, the second features Mirror DS9, Voyager and New Frontier (the first time the mirror New Frontier has ever been seen). Dark Passions and the Shatner novels are not part of the canon as established in these stories.
The first of these collections, Glass Empires, comprises Age of the Empress (describing Hoshi Sato's reign as Empress); The Sorrows of Empire (Spock's career from immediately after Mirror Mirror, to the forging of the Alliance at the mirror-Khitomer Accords; explaining that the fall of the Empire was orchestrated by Spock, forcing the people of the empire to fight for their democracy to make sure the Empire never reformed); and The Worst of Both Worlds (in which JeanLuc Picard, a Terran slave, must defend the Alliance against the even worse threat of the Borg).
The second, Obsidian Alliances, consists of The Mirror-Scaled Serpent (Chakotay's resistance cell encounters Neelix and Kes in the Badlands); Cutting Ties (in which M'k'nzy of Calhoun ("Muck"), a slave of the Romulan Empire, meets the mirror counterparts of the Excalibur crew); and Saturn's Children (in which Kira plots to regain the position of Intendant from Ro Laren, while O'Brien faces discontent in the Resistance). The latter of these ties into the Mirror-Kira's appearance in the Deep Space Nine relaunch series of novels.
The Star Trek: Stargazer novel Three, by Michael Jan Friedman also features the Mirror Universe. Since the Stargazer novels are set during Picard's first command, nearly 40 years before the DS9 crossover, it provides a glimpse of the Mirror Universe during the war between the Empire and the Alliance. In it, the counterpart of a member of the USS Stargazer crew crosses over from the ISS Stargazer to kidnap the Stargazer's chief engineer Simeon for the Empire. The captain of the ISS Stargazer is the counterpart of the USS Stargazer's first officer, Gilaad Ben Zoma.
A further collection entitled Shards and Shadows was released in January 2009.
Various novels have been set in the Deep Space Nine version of the mirror universe, including a trilogy by William Shatner, which reveals the Mirror-Kirk (or "Emperor Tiberius", as he calls himself) was still alive, and plotting to reconquer his Empire. Apparently, it had been he who originally created the Alliance to overthrow Spock, before it turned on him. His right-hand man is Regent Jean-Luc Picard, who works with the counterparts of other Enterprise-E bridge crew. He is opposed in his aims by Mirror-Spock, now the Intendant of the Vulcan Resistance. Mirror versions of Kathryn Janeway, other Voyager crewmembers and Tasha Yar also appeared.
According to the Shatnerverse the Mirror Universe diverged from the standard Star Trek universe due to the events of Star Trek: First Contact. Human space travel was colored by Earth's pre-mature encounter with the Borg and so instead of developing a diverse and peaceful Federation based on exploration, humans created a hostile and military-oriented Empire based on strength and fear.
Dark Passions by Susan Wright is also set before the DS9 episodes, at about the time of The Next Generation. It focussed on the mirror-Seven of Nine, a Terran slave who had been fitted with cybernetics to be a spy for the Obsidian Order. The sequence ended with her escaping in a ship she named Voyager, along with the counterparts of many of the Voyager crew (this may contradict the Shatner novels).
Diane Duane, in her Star Trek: The Next Generation book Dark Mirror (ISBN 0-671-79377-2) offers another explanation of what happened after Captain Kirk and three others of his crew encountered the Mirror Universe. In the novel, the Empire is still very much in existence in the 24th century,and a clear point of divergence is never given. While on the Mirror Enterprise Picard finds several historical works of literature are different from the regular universes.
The Mirror Universe Saga (ISBN 0-930289-96-X) is a trade paperback that reprints eight issues of DC Comics' Star Trek comic book (issues #9 - #15, as well as issue #16 which completed the arc but did not actually involve the Mirror Universe) chronicling an encounter between the Mirror Universe and our own. It is set immediately after the events of Star Trek III: The Search for Spock, which had just been released shortly before the series was first published. The series was credited to Mike W. Barr (head writer for DC's Trek comic at the time), Tom Sutton, and Ricard Villagran. When originally published, this story arc was called "New Frontiers", though it is best known by the title used in this section heading.
The I.S.S. Enterprise obtains the Genesis technology developed by Dr. Carol Marcus then enters our universe to spearhead the Empire's intended conquest of the Federation. Meanwhile, in the "real" universe, Captain Styles of the Excelsior has arrived at Regula I, where Kirk and crew have found temporary safe haven, to take them back to Earth to stand trial for their mutinous actions (as depicted in Star Trek III). When they encounter a mystery attacking ship, Styles overconfidently believes the Excelsior can defeat the attacker, which is an "outdated" Constitution-class ship, but it turns out to be the I.S.S. Enterprise under the command of Mirror-Kirk. The Mirror-Enterprise crew easily overpowers the inexperienced Excelsior crew, taking over the advanced vessel, and Mirror-Kirk dispatches Mirror-Spock (who despite his words at the end of "Mirror, Mirror" had elected to return to Mirror-Kirk's side after all, after logically deducing that the efforts of any one single man would be a useless gesture against the Empire). Mirror-Sulu and Mirror-Chekov travel to Vulcan (aboard Kruge's Klingon bird-of-prey, captured by Kirk during Star Trek III and confiscated by Styles when taking custody of the Enterprise survivors) to find Spock, still recovering from the fal-tor-pan ritual on Vulcan. Kirk and his own crew manage to escape and take over the I.S.S. Enterprise, which is destroyed by remote control by the Mirror-Kirk; the real Kirk's crew survives by escaping in the ship's saucer section.
After retaking the Excelsior from Mirror-Kirk (and placing the Mirror-Enterprise crew in stasis), Kirk takes command of Excelsior and takes it to the Mirror Universe in a gambit of impersonating Mirror-Kirk yet again. His plan is to break the back of the Empire's planned invasion by taking command of the Imperial fleet aboard Excelsior, then turning on the fleet at the critical moment. One Empire officer, a Captain Blaine, is suspicious of Kirk's intentions; however, rather than suspecting Kirk is in fact his counterpart from the other (our) universe, he is familiar with Mirror-Kirk's history of advancing through the ranks by use of treachery and intrigue and thinks Kirk is out to take control of the Empire for himself.
Saavik researches Imperial history to help familiarize the crew with the Mirror Universe and its history, so as to better portray their own counterparts. Her research reveals the likely point of divergence between the two universes - the Romulan War. In our universe, Earth and Romulus fought their war in deep space. In the Mirror Universe, the war was fought in Earth's solar system, and Earth lost. The Romulans held Earth for ten years until a resistance overthrew them. This resistance did not disband once the Romulans were deposed, however; rather, its leaders proclaimed that Earth would no longer be conquered, but rather would be the conquerors themselves. Thus did the resistance movement form the seeds of what would eventually become the Terran Empire.
Meanwhile, Mirror-Spock reaches Vulcan, where he engages in a mind meld with the recovering Spock of our universe. However, once Mirror-Spock touches his mind, Spock is able to reflexively initiate a meld of his own. In the ensuring battle of minds, Spock draws strength to restore his mind, and at the same time, Mirror-Spock becomes reconciled to "our" Spock and the two make common cause to stop the Empire. The two Spocks use the captured Klingon ship to cross into the Mirror universe.
Also seen during this storyline is the counterpart of Kirk's son, David Marcus - still very much alive in the Mirror Universe, and leading a resistance cell against the Empire.
The Empire accepts Kirk's proposal to align with the Romulans and Klingons to defeat the Federation, Klingons and Romulans. However, Kirk and Scott have a plan to disable the entire fleet of Empire ships, then, when sufficiently defeated, disable the Romulan and Klingon ships (correctly suspecting both parties would turn their guns on Excelsior once the battle had ended) and return home. The empire, however, already had its own Excelsior built; they had studied the Federation ship earlier in the arc, and used the data gleaned from this examination for help in making their own Excelsior operational. The Mirror-Excelsior is under the command of Captain Blaine, who had evidently convinced others within the Empire's Admiralty of Kirk's duplicity. Fortunately, Scotty had deliberately screwed up the Excelsior's systems before Empire technicians studied them, giving their scanners false readings; as a result, the Mirror-Excelsior cannot draw enough power to operate and is easily defeated.
The Excelsior then returns to the Federation, having dropped off their mirror counterparts in shuttles. When Mirror-Kirk awakens, he tries to contact the nearest Imperial vessel for assistance - not realizing he and his crew have been branded as traitors after the real Kirk's actions left the Imperial fleet crippled. The I.S.S. Nogura picks up Mirror-Kirk's distress signal, and after verifying the identity of those aboard, destroys the shuttle, killing all aboard. Of the Mirror-Enterprise crew, only Mirror-Spock survives, and he elects to join David Marcus' resistance cell.
After returning to his own universe, Kirk gives a reporter an exclusive on how he and his crew saved the Federation from an invasion about which they would have never known. Her reports in the mass media paint the Enterprise survivors as heroes, much to the consternation of Starfleet brass who still wanted Kirk court-martialed. In the end, facing a public-relations nightmare if they proceeded with a full trial, Starfleet reluctantly gives Kirk full command of the Excelsior, ostensibly for an extended shakedown cruise to help work out all the bugs in its system. With the exception of Spock (who is assigned to a command of his own, the science vessel Surak), Kirk's entire crew joins him on this new mission. This sets up the later Star Trek comics stories which were published in the interim leading up to the release of Star Trek IV: The Voyage Home in 1986.
This story, like all Trek comics stories and novels, is not considered canonical with the main Star Trek universe.
Portions of a number of Star Trek games take place in the Mirror Universe.
A recent Star Trek game -- Star Trek: Shattered Universe -- is set sometime after the original series episode "Mirror, Mirror". In the game, Captain Hikaru Sulu and the crew of the U.S.S. Excelsior swap places with the crew of the I.S.S. Excelsior thanks to a localized stellar ion storm. They are hunted by Mirror-Chekov, who commands the I.S.S. Enterprise, and assisted by the Mirror-Klingons and Mirror-Romulans. During their trek home, the Excelsior crew encounter Mirror Universe variations of the original series' missions, including the M-5 multitronic computer, a giant space-amoeba and a Doomsday Machine, although the latter is under the escort of the ISS Constellation and ISS Intrepid.
While the game takes place at some point during the era of the Star Trek films, it is unclear exactly when. The Enterprise has not yet been decommissioned, but Sulu is in command of the Excelsior, placing the game somewhere in the timeframe of "Star Trek V: The Final Frontier" and "Star Trek VI: The Undiscovered Country". Spock has not yet completed his coup d'état -- the Empire contacts Mirror-Chekov several times during his mission to capture Sulu -- but there is still much time for that to occur in the Mirror Universe timeline. There is no indication the character of Kirk, either version, is involved in the storyline.
During the Star Trek game -- Star Trek: Voyager Elite Force -- the crew of the U.S.S. Voyager are trapped in what is called a 'ship's graveyard'. Among the wreckage of ships there is an unidentified Constitution class vessel from the mirror universe crewed entirely by humans. It is made apparent that this vessel is from the mirror universe by the 'sword in the earth' symbol on the walls of the ship, the uniforms of the crew, and the fact that they attack hand to hand with daggers instead of phasers (It is shown in Mirror Mirror that crew members are equipped with daggers). These members of the Terran Empire have presumably been trapped in the graveyard for many years and have formed an alliance with crews of Klingons, Malons and Hirogen, though it is unknown if any of these races are also from the mirror universe. This alliance practices piracy and scavenges ships within the graveyard, taking by force any needed supplies and weaponry. Their own ship appears to have been heavily damaged and has received many emergency repairs. Many of the ships belonging to the Klingons, Malons, Hirogen and Terran Empire have been joined together to form a base of operations. This is referred to as 'The Scavenger Base'.
The members of the Voyager's Hazard Team, a specially trained group of officers trained to deal with unusual threats, are sent to board this base of operations in order to recover isodesium. This substance is needed to survive against the power-draining effects of the graveyard.
In Star Trek: Starfleet Command, a player who eventually joins the Starfleet Special Forces during the Federation campaign will be launched on a series of missions involving the mirror universe. It begins with an encounter involving the destroyer USS Boston during an experimental "star tap" test, capturing the player's counterpart (in exactly the same ship as the player's main vessel) when the player is accused of crimes against other empires, and a showdown on Earth against a fleet of Doomsday Machines led by the mirror counterpart of Matthew Decker, who is supreme commander of the Imperial forces.
The game Star Fleet Battles features a series of scenarios in which the Mirror Universe Imperial Starfleet attacks the Federation. At first, the Imperial vessels show up and cause quite a stir. A destroyer is taken into custody, revealing all sorts of strange things such as an agony booth. Captain Decker is captured in one of the scenarios and eventually, the player must fight himself and an identical ship. Commodore Decker is the leader of the invaders and in an ironic twist, reactivates a squadron of "planet killers", c.f. "The Doomsday Machine" of TOS in order to destroy Earth.
While in the "Alternative Factor", the Lazarus of the alternate universe said that to meet his counterpart would cause the destruction of both his and our universe, while in later episodes characters met their counterparts in the Mirror-Universe and the meetings did not cause any apparent damage to either universe. This apparent discrepancy is explained by the explicit statement made in the episode that the alternate Lazarus is from an anti-matter universe; it has long been established in "Star Trek" canon that physical contact between matter and its anti-matter counterpart is catastrophic.