Star Trek (1966–1969)
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Spock's Brain 

The crew of the Enterprise pursues a mysterious woman who has abducted Spock's brain.


Marc Daniels


Gene Roddenberry (created by), Gene L. Coon (as Lee Cronin) | 1 more credit »

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Episode complete credited cast:
William Shatner ... Capt. Kirk
Leonard Nimoy ... Mr. Spock
DeForest Kelley ... Dr. McCoy
Marj Dusay ... Kara
James Doohan ... Scott
Walter Koenig ... Chekov
George Takei ... Sulu
Nichelle Nichols ... Uhura
Majel Barrett ... Nurse Chapel
James Daris James Daris ... Creature
Sheila Leighton Sheila Leighton ... Luma


The Enterpise is approached by an ion-propelled craft (much to Eng. Scott's liking); from it enters a female who renders everyone unconscious. When the crew wakes up, McCoy finds Spock alive in sick bay but with his brain surgically removed. McCoy urges its quick restoration if he's to survive at all. Desperately Kirk follows an ion-trail to a system where he gambles on an icy planet populated by a simple-minded all-male race of large cavemen who attack them. The landing party captures one, who says Kirk and crew are small like 'The Others' - bringers of pain and delight - whom they fear. McCoy brings down Spock's body, mobilized with a mechanical brain-substitute installed. They enter the acclimatized, underground dwelling of 'The Others' - a similarly simple-minded all-female race of enslavers - and overpower female Luma by surprise. Kirk makes communicator contact with Spock, who knows not where he is but is aware of autonomic functions. As they finally find Kara, the female ... Written by KGF Vissers

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TV-PG | See all certifications »

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Release Date:

20 September 1968 (USA) See more »

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Did You Know?


The Controller is "Nomad" repurposed from Star Trek: The Changeling (1967) with a globe on top. See more »


Scotty seems fascinated by "ion power" as if it is something far beyond Federation technology. However, in first season's "The Menagerie" a standard Star Fleet shuttlecraft is described by the computer as "ion powered". See more »


Creature: Your words say nothing.
See more »

Alternate Versions

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


Referenced in Star Trek New Voyages: Phase II: Mind-Sifter (2014) See more »

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User Reviews

A Female Alien Steals Spock's Brain
12 January 2017 | by Rainey-DawnSee all my reviews

Season 3, episode 1. The Enterprise encounters an ion-propelled craft. A female appears on the bridge and uses a device to knock them all out, when they awake Spock is not moving. McCoy takes Spock to sickbay, examines him only to find Spock's brain missing - surgically removed - all nerve endings are repaired -- Spock's Vulcan body is fine just his brain is missing. Kirk and crew follows the ion trail to the 6th planet in that solar system. Kirk takes a gamble and beams down with Chekov, Scotty and a couple of red shirts to inspect the icy planet. They run across a primitive group of humans - they refer to the others as bringers of pain. Kirk then has McCoy to beam down to check some remains and when he does, he brings Spock's remote controlled body along. Kirk okays Spock's body with them and they do some investigating to find a large underground facility. Kirk uses his communicator and picks up Spock's brainwave thoughts, Spock responds to Kirk and search crew. As they move along to find Spock's brain they are captured by the aliens. The aliens seem to know nothing when they speak to Kirk and crew... but eventually get information about a controller. It seems Spock's brain is the controller and Kirk and crew want to speak to the Controller. It's a matter of finding Spock's brain and putting it in Spock's body but McCoy's medical knowledge is limited and Spock will have to help him with the surgery.

It's not a great episode kinda on the silly side but fun to watch.


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