26 user 8 critic

Mirror, Mirror 

A transporter accident places Captain Kirk's landing party in an alternate universe, where the Enterprise is in the service of a barbarically brutal empire.


Marc Daniels


Gene Roddenberry (created by), Jerome Bixby




Episode complete credited cast:
William Shatner ... Capt. Kirk
Leonard Nimoy ... Mr. Spock
DeForest Kelley ... Dr. McCoy
BarBara Luna ... Marlena (as Barbara Luna)
James Doohan ... Scott
George Takei ... Sulu
Nichelle Nichols ... Uhura
Vic Perrin Vic Perrin ... Tharn
Walter Koenig ... Chekov
John Winston John Winston ... Lt. Kyle
Garth Pillsbury ... Wilson
Pete Kellett 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 fkelleghan@aol.com

Plot Summary | Plot Synopsis


TV-PG | See all certifications »


Official Sites:

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Release Date:

6 October 1967 (USA) See more »

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Technical Specs


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Did You Know?


The only time in the series when someone replies to Doctor McCoy's "I'm a doctor..." line. McCoy says "I'm a doctor, not an engineer." Scotty answers, "Now, you're an engineer." 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 »


Mirror Spock: Terror must be maintained or the Empire is doomed.
See more »

Alternate Versions

Special Enhanced version Digitally Remastered with new exterior shots and remade opening theme song See more »


Referenced in Star Trek: Discovery: What's Past Is Prologue (2018) See more »

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User Reviews

A Couple of Kirks
28 April 2014 | by HitchcocSee all my reviews

I recently watched an old episode of The Twilight Zone where an astronaut returns to Earth and to a family that isn't quite right. The concept of a parallel universe has been a part of scifi for a long time. In this episode, after negotiating with a planet to gain dilithium crystals, Kirk beams up. At that very time, something happens, sending him into another universe. it contains similar characters though they are beset with avarice and evil. Even Spock has accepted the fact that maintain discipline he must inflict pain on people, even kill them. Of course, if good Kirk is on this starship, his counterpart is on the Enterprise we know. Of course, here comes the fun. The good Kirk must figure out what happened and find some way to turn things back. The other Kirk sticks out like a sore thumb but has the power of his position. So things aren't so easy to remedy. This is a wonderful use of a unique situation and the writers don't waste it. What's neat is that the good Kirk tries to initiate change on the new ship, so he isn't just single minded in his efforts.

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