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The episode introduces the alternate reality " Mirror Universe" concept in Star Trek for the first time. The stardate of the episode was never revealed.
Quick Overview: A transporter mishap slips Captain Kirk and his companions into a parallel universe.
After failing to persuade the Halkan Council to allow the Federation to mine dilithium crystals on their planet, Captain James T. Kirk, along with Dr. McCoy, Scotty, and Lt. Uhura, return back to the Enterprise. The effects of an ion storm however, create a mishap during transport, and the landing team beams aboard an unfamiliar Enterprise.
The team discover they have entered a parallel universe to their own, where the U.S.S. Enterprise is called an Imperial Starship or I.S.S. Enterprise, and the Federation is now called the Terran EmpireThe Terran Empire is, in the fictional universe of Star Trek an alternate-history counterpart of the United Federation of Planets. It appears to differ from the Federation in almost all ways — where the Federation is peaceful, the Empire is violent to the. The group's uniforms have also changed into more "revealing" outfits, including a decorative sash tied about their waists. Uhura now bares her torso, while Kirk's casual uniform is a sleeveless tunic. Kirk also notices he now has a set of strange medals on his chest.
The group's first experience in this hellish reality is the unforgiving torture of the transporter operator by Mr. SpockThis article is about the Star Trek character Mr. For the pediatrician Dr. Spock, see Benjamin Spock. For the Swedish synthpop band, see S. For the asteroid, see 2309 Mr. One of the most famous characters from the original Star Trek television series is t who now sports a menacing looking goateeA goatee is a beard formed by a tuft of hair on the chin, resembling that of a billy goat. The goatee underwent a rennaissance in the 1990s, when a close-cropped variant with an integrated moustache was popularized by the baseball players, athletes and sp, and a device called an agonizerIn the fictional Star Trek universe, an agonizer is a device from the Mirror Universe reality, that is used to punish insubordination of personnel on board an Imperial starship. Developed by the Terran Empire, the small palm-sized device is usually clippe. Mr. Spock administers the punishment for almost losing the Captain to the operator's carelessness. Almost immediately, Kirk guesses that the "other" landing party must have beamed aboard his Enterprise but the crew here doesn't know this. The team decides to impersonate their mirror image counterparts for now, until they find a way to return to their universe.
Fortunately, their fears of what their counterparts could be doing in their universe were groundless. Back on the U.S.S. Enterprise Mr. Spock immediately discovers the persona of his Captain and the rest of the landing party has changed significantly and orders security to take them to a holding cell. The anti-Kirk tries to bribe Spock with rewards of "his own command" if he's freed. Spock simply replies "fascinating" and goes about his investigation into what has happened. Spock determines that the ion storm must have opened a barrier between parallel universes, and somehow, the landing team's counterparts switched places.
Back on the I.S.S. Enterprise Kirk goes to his quarters, which is very different that he's used to, and examines his mission orders. He learns that he has been ordered to annihilate the Halkans if they refuse the Empire's "request" to mine dilithium. Horrified, Kirk studies his counterpart's records further, learning he succeeded command of the I.S.S. Enterprise by assassinating Captain Christopher PikeChristopher Pike is a fictional character in Star Trek. He appeared in the pilot episode The Cage as captain of the Starship Enterprise, and was then played by Jeffrey Hunter. This pilot was rejected; another was made, and the character of Pike was droppe, and that he also was responsible for mass murdering 5000 colonists on Vega IX .
Anti-Spock informs Kirk that the ship is ready to attack the Halkans, and Scott reports that he failed to sabotage the weapons systems. Desperately, Kirk orders a delay in the attack for 12 hours. This piques Spock's curiosity, but he obeys the order. Kirk then survives an assassination attempt by Mr. ChekovPavel Chekov a character from the fictional Star Trek universe, was the Navigator and Weapons Officer on the Starship Enterprise. His rank was Ensign in Star Trek: The Original Series, but was promoted to the rank of lieutenant in Star Trek: The Motion Pi, and Spock subjects Chekov to an agony boothIn the fictional Star Trek universe, an agony booth is a device from the Mirror Universe reality, that is used to punish insubordination of personnel on board an Imperial starship. Developed by the Terran Empire, the agony booth is a man-sized glass box t and tortures him. Kirk finds out the fastest way to promotion around here is to successfully kill your superior, especially when they appear to be neglecting their duties.
Meanwhile, Scotty and McCoy work secretly to figure out what happened with the transporter. While Scotty is finding a way to return them back to the correct universe, Kirk meets the beautiful Lt. Marlena Moreau , who refers to herself as the "Captain's Woman." At the same time, anti-Spock reports the suspicious activity of his Captain to the Imperial Command, and receives orders to kill Captain Kirk if he does not carry out the order to destroy the resisting Halkans.
Back in Kirk's quarters, Marlena discovers her Captain has changed, and Kirk tells her he is from a different universe and must find a way back to his. She shows Kirk the Tantalus FieldIn the fictional Star Trek universe, a Tantalus Field is a device from the Mirror Universe reality. The Mirror Universe version of Captain James T. Kirk had a Tantalus generator device installed in his quarters. He obtained the device from the plunder of, a device which can secretly monitor anyone on the ship and "eliminate" them at his leisure. During a second assassination attempt, this time by Lt. Sulu, Marlena kills Sulu's conspirators with the device.
Kirk continues to stall Spock until his team can find a way back to their reality, however Spock, not wanting command of the Enterprise, as it would make him an instant target of assassination, decides instead to study the Captain as long as he can. Marlena wants her Kirk back as well, and helps the team return as much as she can.
Scotty reports to Kirk that he may have finally found a way back. Still thinking anti-Spock will be a problem, Kirk knocks him unconscious, and Uhura, Kirk, and Scotty head for the transporter room while McCoy stays behind to make sure that anti-Spock is all right. Spock suddenly comes to and quickly mind melds with McCoy. He discovers that the switch had occurred, but anti-Spock surprisingly agrees to assist Kirk in returning his landing party to their own universe. This gesture confers in Kirk that this Mr. Spock is still an honest and cooperative person despite the current environment. He suggests to anti-Spock a revolution, that a Federation-like system is better and more logical than the ruthless totalitarianism of the Empire. Anti-Spock agrees to consider the idea and is encouraged when told about the Tantalus Field he could use.
Meanwhile on board the U.S.S. Enterprise, Spock decides to attempt the beaming sequence at the same time the I.S.S Enterprise attempts theirs. He has the anti-landing party take their positions on the transporter pads and prepares to beam them out. The transport begins at the same time the Imperials beam their party out. The switch back occurs successful, and the landing party is repulsed when they learn about their counterpart's barbaric personalities.
Later, back on the bridge, Kirk meets Lt. Marlena Moreau, who is quite a different girl than what he experienced her to be in the other universe.