Star Trek (1966–1969)
35 user 6 critic

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 »

Watch Now

With Prime Video





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

Plot Summary | Add Synopsis


TV-PG | See all certifications »

Parents Guide:

View content advisory »


Official Sites:

Official site





Release Date:

20 September 1968 (USA) See more »

Company Credits

Show more on IMDbPro »

Technical Specs


Sound Mix:




Aspect Ratio:

See full technical specs »

Did You Know?


This is the first episode in broadcast order in which the credits are displayed in blue font as opposed to the yellow font of the first two seasons. See more »


The Morgs are supposedly a primitive, almost caveman-like species, yet the seams on their clothing are perfectly stitched. How are they able to stitch such perfect clothing if they haven't even progressed past the stone age and haven't learned to use iron? See more »


Kara: Brain and brain! What is *brain*? It is Controller, is it not?
Dr. McCoy: Yes. Yes, in a way, it is. The human brain controls the individual's functions.
Captain James T. Kirk: [with dawning realization] Bones... Scotty... Spock's... brain... controls.
See more »

Alternate Versions

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


Featured in Bring Back... Star Trek (2009) See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

A great start to the third series !
30 January 2008 | by Dr_SibilanceSee all my reviews

Spock's Brain is an incredible episode.

This episode has all the beautiful traits that make Original Series Star Trek so popular. The actors perform with charm and enthusiasm, the story is engaging despite the low budget sets and props, and we also catch a glimpse of Mccoy's compassionate feelings for Spock, which is something we don't often see.

This particular episode has a good balance of cheap gags, classic hammy acting from shatner (which we can't get enough of) and suspense.

The only flaw with this episode is that the back story to the scenario could have been elaborated on a little more. The situation the crew find themselves in seems rather vague at times but this doesn't ruin the show.

If you love Original Series, don't skip on this one.

14 of 30 people found this review helpful.  Was this review helpful to you? | Report this
Review this title | See all 35 user reviews »

Contribute to This Page

Stream Action and Adventure Titles With Prime Video

Explore popular action and adventure titles available to stream with Prime Video.

Start your free trial

Recently Viewed