The Mirror Universe is a fictional parallel universe in which the plots of several Star Trek television episodes take place. It resembles the fictional universe in which the Star Trek TV series takes place, but is separate from the main universe. The characters in the Mirror Universe are aggressive, mistrustful, and opportunistic in personality. Whereas the Star Trek universe depicts an optimistic future in which the Earth-based United Federation of Planets values peace, co-operation and exploration, episodes set in the Mirror Universe feature the human-dominated Terran Empire which values conquest instead. The Mirror Universe has been visited in one episode of Star Trek: The Original Series, five episodes of Star Trek: Deep Space Nine and a two-part episode of Star Trek: Enterprise as well as several non-canon Star Trek novels and video games. It is named after "Mirror, Mirror", the original series episode in which it first appeared.
The Original Series
The Mirror Universe was first introduced in the original Star Trek episode "Mirror, Mirror", which featured the brutal Terran Empire, run by humans and their Vulcan allies, in place the United Federation of Planets. The Mirror Captain Kirk of the ISS Enterprise was a mass murderer who was promoted to Captain after assassinating Captain Christopher Pike. Discipline aboard starships was enforced through torture — either through agonizers carried by crewmembers or agony booths. Officers were barbaric in behavior and advanced in rank by killing superiors who they thought were incompetent. Roman/Nazi-style military salutes were used by crewmembers to show loyalty to their captain.
|TOS||204||"Mirror, Mirror"||Four crewmembers 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. (No elements from the Mirror Universe are shown or mentioned anywhere in this episode. Its connection with the Mirror Universe was established retrospectively by "In a Mirror, Darkly").|
Deep Space Nine
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 five Mirror Universe episodes over the course of five seasons. The show reveals that when exposed to individuals from the normal universe, the Terran Empire began to reform itself for the better, but was overthrown in the 23rd century by an alliance of alien species who took advantage of the Empire's self-weakening and conquered it, enslaving Terrans and Vulcans in the process.
|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 an 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 to save the mirror version of his late wife.|
|DS9||419||"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.|
|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 alternative universe, the USS Defiant, has travelled to their universe through some kind of rip in space. All of the crewmembers except Captain Forrest evacuate the ISS 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.|
In addition to the TV episodes several novels make use of the Mirror Universe setting, as well a number of short stories in Star Trek anthologies. Elements of these novels may contradict continuity as established in later TV episodes.
Star Trek: Stargazer
Diane Duane, in her Star Trek: The Next Generation book Dark Mirror 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 in existence in the 24th century. The point of divergence initially appears appears to be the Eugenics Wars where the genetic supermen were not defeated and eventually turned on each other resulting in atomic war but works dating back to the days of ancient Greece supporting the Empire's current mindset are noted.
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 the Empire.
Star Trek: Mirror Universe
A further collection entitled Shards and Shadows was released in January 2009. The Mirror Universe storyline was concluded in the novel Rise Like Lions, released in November 2011. A further story taking place in the Mirror Universe, Section 31 - Disavowed, was released in October 2014.
A number of Star Trek games take place in the Mirror Universe or reference it. Among them, the first-person shooter Star Trek Voyager: Elite Force, the massively multiplayer online game Star Trek Online, the battle simulator Star Trek: Shattered Universe which is entirely set in the Mirror Universe, Decipher's tabletop roleplaying game,[which?] and Star Trek: Attack Wing.
The Mirror Universe Saga 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.
This story, like all Trek comics stories and novels, is not considered canonical with the main Star Trek universe.
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