Star Trek: Season 2, Episode 4

Mirror, Mirror (6 Oct. 1967)

TV Episode  |   |  Action, Adventure, Mystery
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Ratings: 9.2/10 from 1,560 users  
Reviews: 16 user | 6 critic

A transporter accident places Capt. Kirk's landing party in an alternate universe, where the Federation is a barbarically brutal empire.



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Episode complete credited cast:
Marlena (as Barbara Luna)
Vic Perrin ...
John Winston ...
Pete Kellett ...
Kirk's Henchman


Beamed up during an ion storm, which causes a transporter malfunction, the landing party of Kirk, McCoy, Scotty and Uhura find themselves in a mirror universe aboard a parallel Enterprise run by ruthless barbarians. The ion storm also caused their malicious counterparts to beam to the real starship. Kirk and the others must find a way home before they are discovered and exposed by their parallel crew members, who use treachery, back-stabbing and seduction to get what they want. Written by

Plot Summary | Plot Synopsis


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Release Date:

6 October 1967 (USA)  »

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Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


In the mirror universe, the male computer explains that James Kirk became Captain by murdering his predecessor Christopher Pike, a character played in previous installments by Jeffrey Hunter and Sean Kenney. This is possibly the only time in TOS where Pike is mentioned but does not appear. See more »


When the landing party is in the middle of the cross-universe transfer, the USS/ISS Enterprise is seen in orbit going in opposite directions (USS Enterprise going counterclockwise [when viewed from above]; ISS Enterprise going clockwise). However, through the rest of this episode, the ISS Enterprise is going counterclockwise. See more »


Bones: I'm a doctor, NOT an engineer.
Scotty: NOW you're an engineer.
See more »


Referenced in Star Trek: Enterprise: United (2005) See more »

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User Reviews

One of the best TOS episodes ever
5 March 2011 | by (United States) – See all my reviews

Kirk, McCoy, Scott, and Uhura get thrust into an alternate reality where the Federation is an evil empire and their shipmates and friends are now malicious, dangerous adversaries. Now the four have to find a way to get back to their own reality without being discovered and killed.

This is one of the best-written, best-acted TOS episodes ever. Ordinarily there is some aspect of the writing to nitpick about. Not here. Every action anybody takes makes sense, the characters are developed superbly, and the pacing is swift and invigorating. This is quality TV writing, and if every script had been this good the series would have lasted a lot longer, I think. One moment I'd like to point out especially: early on Kirk proposed to disable the phasers so they can avoid phaser-bombing a helpless planet, but Scottie subtly reports to Kirk he cannot because the phaser banks are being guarded. This is good writing: the good guys had a sensible (not contrived) solution to a problem, and the obstacle to that solution also made perfect sense (and was not contrived). That makes the tension feel very real.

The acting takes it over the top. William Shatner's Kirk displays the quick wits and cleverness that make the character so interesting. And notice how our good guy Kirk is not entirely uncomfortable in his new, dangerous environment. Sure, he's disgusted by all the cruelty around him, but you can sense he gets a thrill out of navigating all the treachery. Leonard Nimoy's evil version of Spock is genuinely menacing in a cool, calculating way. Nichelle Nichols' Uhura shows us a cunning, wily side of her we have only ever seen suggested before (and check her out in that revealing outfit.) But the acting prize goes to George Takei. In this episode, his evil Sulu is slimy, sleazy, scary, and wonderfully despicable. As another reviewer suggested, Takei should have played more villains.

Overall, Mirror, Mirror is a ten.

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