Seasons & episodes
S3 · E1Spock's Brain 1968-09-20 · 51 min
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.
S3 · E2The Enterprise Incident 1968-09-27 · 51 min
The crew of the Enterprise are on a secret mission to steal a Romulan cloaking device.
S3 · E3The Paradise Syndrome 1968-10-04 · 51 min
An alien device on a primitive planet erases Captain Kirk's memory, and he begins a new life with the planet's indigenous people.
S3 · E4And the Children Shall Lead 1968-10-11 · 51 min
On a distant planet, Kirk, Spock and McCoy find a scientific team dead, and their children who, unknown to the crew, have great powers at their disposal.
S3 · E5Is There in Truth No Beauty? 1968-10-18 · 51 min
The Enterprise travels with an alien ambassador whose appearance induces madness.
S3 · E6Spectre of the Gun 1968-10-25 · 51 min
Having been found trespassers into Melkotian space, Captain Kirk and his companions are sent to die in a re-enactment of the gunfight at the O.K. Corral.
S3 · E7Day of the Dove 1968-11-01 · 51 min
An alien force drives the crew of the Enterprise into brutal conflict with the Klingons.
S3 · E8For the World Is Hollow and I Have Touched the Sky 1968-11-08 · 51 min
The crew of the Enterprise rush to stop an asteroid from colliding with a Federation world, but discover the asteroid is actually an inhabited generation ship.
S3 · E9The Tholian Web 1968-11-15 · 50 min
Captain Kirk is caught between dimensions while the crew of the Enterprise works to retrieve him. All the while, the Tholians demand that the Enterprise leave their space.
S3 · E10Plato's Stepchildren 1968-11-22 · 51 min
The crew of the Enterprise encounters an ageless and sadistic race of humanoids with the power of telekinesis and who claim to have organized their society around Ancient Greek ideals.
S3 · E11Wink of an Eye 1968-11-29 · 51 min
Invisible "time-accelerated" aliens take over the Enterprise and attempt to abduct the crew for use as "genetic stock".
S3 · E12The Empath 1968-12-06 · 51 min
While visiting a doomed planet, the landing party is subject to torturous experiments by powerful aliens.
S3 · E13Elaan of Troyius 1968-12-20 · 51 min
The USS Enterprise ferries a spoiled princess whose betrothal to a royal Troyian is hoped will bring peace to a star system at war.
S3 · E14Whom Gods Destroy 1969-01-03 · 51 min
Captain Kirk faces off with a demented shape-shifting starship captain determined to control the universe.
S3 · E15Let That Be Your Last Battlefield 1969-01-10 · 51 min
The Enterprise encounters two duo-chromatic and mutually belligerent aliens who put the ship in the middle of their old conflict.
S3 · E16The Mark of Gideon 1969-01-17 · 51 min
A race of overpopulated aliens abduct Captain Kirk to solve their problem.
S3 · E17That Which Survives 1969-01-24 · 51 min
Kirk, McCoy, and Sulu are stranded on a barren planet where a mysterious woman attempts to kill them one at a time, while the Enterprise must travel halfway across the galaxy to rescue them.
S3 · E18The Lights of Zetar 1969-01-31 · 51 min
Strange incorporeal aliens threaten the Memory Alpha station and the Enterprise.
S3 · E19Requiem for Methuselah 1969-02-14 · 51 min
The crew of the Enterprise encounter an immortal human in this science fiction variation on Shakespeare's The Tempest.
S3 · E20The Way to Eden 1969-02-21 · 51 min
The Enterprise picks up a group of space "hippies" looking for Eden.
S3 · E21The Cloud Minders 1969-02-28 · 51 min
Captain Kirk races against time to acquire plague-fighting minerals from a world in the midst of a civil uprising against a grievous social class disparity.
S3 · E22The Savage Curtain 1969-03-07 · 51 min
Aliens force Captain Kirk and First Officer Spock to join forces with "Abraham Lincoln" and "Surak" to battle villains in a contest of good vs. evil.
S3 · E23All Our Yesterdays 1969-03-14 · 51 min
Kirk, Spock and McCoy are trapped in two parts of another planet's past - a world threatened with destruction when its sun goes supernova.
S3 · E24Turnabout Intruder 1969-06-03 · 51 min
The Enterprise is in danger when Janice Lester, one of Kirk's former lovers, steals his body.