#1 | 09/20/1968Spock's Brain2.9/5 (with 30 votes)
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.
#2 | 09/27/1968The Enterprise Incident3.9/5 (with 33 votes)
The crew of the Enterprise are on a secret mission to steal a Romulan cloaking device.
#3 | 10/04/1968The Paradise Syndrome3.3/5 (with 35 votes)
An alien device on a primitive planet erases Captain Kirk's memory, and he begins a new life with the planet's indigenous people.
#4 | 10/11/1968And the Children Shall Lead2.8/5 (with 33 votes)
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.
#5 | 10/18/1968Is There in Truth No Beauty?3.5/5 (with 32 votes)
The Enterprise travels with an alien ambassador whose appearance induces madness.
#6 | 10/25/1968Spectre of the Gun3.4/5 (with 32 votes)
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.
#7 | 11/01/1968Day of the Dove3.7/5 (with 33 votes)
An alien force drives the crew of the Enterprise into brutal conflict with the Klingons.
#8 | 11/08/1968For the World Is Hollow and I Have Touched the Sky3.5/5 (with 29 votes)
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.
#9 | 11/15/1968The Tholian Web3.7/5 (with 34 votes)
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.
#10 | 11/22/1968Plato's Stepchildren3.4/5 (with 32 votes)
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.
#11 | 11/29/1968Wink of an Eye3.7/5 (with 31 votes)
Invisible "time-accelerated" aliens take over the Enterprise and attempt to abduct the crew for use as "genetic stock".
#12 | 12/06/1968The Empath3.1/5 (with 29 votes)
While visiting a doomed planet, the landing party is subject to torturous experiments by powerful aliens.
#13 | 12/20/1968Elaan of Troyius3.3/5 (with 31 votes)
The USS Enterprise ferries a spoiled princess whose betrothal to a royal Troyian is hoped will bring peace to a star system at war.
#14 | 01/03/1969Whom Gods Destroy3.4/5 (with 28 votes)
Captain Kirk faces off with a demented shape-shifting starship captain determined to control the universe.
#15 | 01/10/1969Let That Be Your Last Battlefield3.6/5 (with 29 votes)
The Enterprise encounters two duo-chromatic and mutually belligerent aliens who put the ship in the middle of their old conflict.
#16 | 01/17/1969The Mark of Gideon3.2/5 (with 28 votes)
A race of overpopulated aliens abduct Captain Kirk to solve their problem.
#17 | 01/24/1969That Which Survives3.2/5 (with 27 votes)
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.
#18 | 01/31/1969The Lights of Zetar3.2/5 (with 27 votes)
Strange incorporeal aliens threaten the Memory Alpha station and the Enterprise.
#19 | 02/14/1969Requiem for Methuselah3.4/5 (with 26 votes)
The crew of the Enterprise encounter an immortal human in this science fiction variation on Shakespeare's The Tempest.
#20 | 02/21/1969The Way to Eden2.8/5 (with 26 votes)
The Enterprise picks up a group of space "hippies" looking for Eden.
#21 | 02/28/1969The Cloud Minders3.5/5 (with 27 votes)
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.
#22 | 03/07/1969The Savage Curtain3.2/5 (with 27 votes)
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.
#23 | 03/14/1969All Our Yesterdays3.7/5 (with 26 votes)
Kirk, Spock and McCoy are trapped in two parts of another planet's past - a world threatened with destruction when its sun goes supernova.
#24 | 06/03/1969Turnabout Intruder3.4/5 (with 24 votes)
The Enterprise is in danger when Janice Lester, one of Kirk's former lovers, steals his body.