S03E01: Spock's Brain
An alien female beams aboard the ship and, after incapacitating the rest of the crew, surgically removes Spock's brain. Kirk and the crew have just hours to locate and replace it before Spock's body dies.
Previous Episode 
Season 1
The Man Trap
S1E1 / 08 Sep 1966
Charlie X
S1E2 / 15 Sep 1966
Where No Man Has Gone Before
S1E3 / 22 Sep 1966
The Naked Time
S1E4 / 29 Sep 1966
The Enemy Within
S1E5 / 06 Oct 1966
Mudd's Women
S1E6 / 13 Oct 1966
What Are Little Girls Made Of?
S1E7 / 20 Oct 1966
Miri
S1E8 / 27 Oct 1966
Dagger of the Mind
S1E9 / 03 Nov 1966
The Corbomite Maneuver
S1E10 / 10 Nov 1966
The Menagerie (1)
S1E11 / 17 Nov 1966
The Menagerie (2)
S1E12 / 24 Nov 1966
The Conscience of the King
S1E13 / 08 Dec 1966
Balance of Terror
S1E14 / 15 Dec 1966
Shore Leave
S1E15 / 29 Dec 1966
The Galileo Seven
S1E16 / 05 Jan 1967
The Squire of Gothos
S1E17 / 12 Jan 1967
Arena
S1E18 / 19 Jan 1967
Tomorrow Is Yesterday
S1E19 / 26 Jan 1967
Court Martial
S1E20 / 02 Feb 1967
The Return of the Archons
S1E21 / 09 Feb 1967
Space Seed
S1E22 / 16 Feb 1967
A Taste of Armageddon
S1E23 / 23 Feb 1967
This Side of Paradise
S1E24 / 02 Mar 1967
The Devil in the Dark
S1E25 / 09 Mar 1967
Errand of Mercy
S1E26 / 23 Mar 1967
The Alternative Factor
S1E27 / 30 Mar 1967
The City on the Edge of Forever
S1E28 / 06 Apr 1967
Operation: Annihilate!
S1E29 / 13 Apr 1967
Season 2
Amok Time
S2E1 / 15 Sep 1967
Who Mourns for Adonais?
S2E2 / 22 Sep 1967
The Changeling
S2E3 / 29 Sep 1967
Mirror, Mirror
S2E4 / 06 Oct 1967
The Apple
S2E5 / 13 Oct 1967
The Doomsday Machine
S2E6 / 20 Oct 1967
Catspaw
S2E7 / 27 Oct 1967
I, Mudd
S2E8 / 03 Nov 1967
Metamorphosis
S2E9 / 10 Nov 1967
Journey to Babel
S2E10 / 17 Nov 1967
Friday's Child
S2E11 / 01 Dec 1967
The Deadly Years
S2E12 / 08 Dec 1967
Obsession
S2E13 / 15 Dec 1967
Wolf in the Fold
S2E14 / 22 Dec 1967
The Trouble With Tribbles
S2E15 / 29 Dec 1967
The Gamesters of Triskelion
S2E16 / 05 Jan 1968
A Piece of the Action
S2E17 / 12 Jan 1968
The Immunity Syndrome
S2E18 / 19 Jan 1968
A Private Little War
S2E19 / 02 Feb 1968
Return to Tomorrow
S2E20 / 09 Feb 1968
Patterns of Force
S2E21 / 16 Feb 1968
By Any Other Name
S2E22 / 23 Feb 1968
The Omega Glory
S2E23 / 01 Mar 1968
The Ultimate Computer
S2E24 / 08 Mar 1968
Bread and Circuses
S2E25 / 15 Mar 1968
Assignment: Earth
S2E26 / 29 Mar 1968
Season 3
Spock's Brain
S3E1 / 20 Sep 1968
The Enterprise Incident
S3E2 / 27 Sep 1968
The Paradise Syndrome
S3E3 / 04 Oct 1968
And the Children Shall Lead
S3E4 / 11 Oct 1968
Is There in Truth No Beauty?
S3E5 / 18 Oct 1968
Spectre of the Gun
S3E6 / 25 Oct 1968
Day of the Dove
S3E7 / 01 Nov 1968
For the World Is Hollow and I Have Touched the Sky
S3E8 / 08 Nov 1968
The Tholian Web
S3E9 / 15 Nov 1968
Plato's Stepchildren
S3E10 / 22 Nov 1968
Wink of an Eye
S3E11 / 29 Nov 1968
The Empath
S3E12 / 06 Dec 1968
Elaan of Troyius
S3E13 / 20 Dec 1968
Whom Gods Destroy
S3E14 / 03 Jan 1969
Let That Be Your Last Battlefield
S3E15 / 10 Jan 1969
The Mark of Gideon
S3E16 / 17 Jan 1969
That Which Survives
S3E17 / 24 Jan 1969
The Lights of Zetar
S3E18 / 31 Jan 1969
Requiem for Methuselah
S3E19 / 14 Feb 1969
The Way to Eden
S3E20 / 21 Feb 1969
The Cloud Minders
S3E21 / 28 Feb 1969
The Savage Curtain
S3E22 / 07 Mar 1969
All Our Yesterdays
S3E23 / 14 Mar 1969
Turnabout Intruder
S3E24 / 03 Jun 1969
William Shatner
James T. Kirk
Leonard Nimoy
Spock
DeForest Kelley
Dr. McCoy
James Doohan
Scott
Walter Koenig
Pavel Chekov
George Takei
Sulu
