1. Spock's Brain
Aired: Sep 20, 1968The crew of the Enterprise pursues a mysterious woman who has abducted Spock'...
2. The Enterprise Incident
Aired: Sep 27, 1968An apparently insane Capt. Kirk has the Enterprise deliberately enter the Rom...
3. The Paradise Syndrome
Aired: Oct 4, 1968Trapped on a planet whose inhabitants are descended from Northwestern Native ...
4. And the Children Shall Lead
Aired: Oct 11, 1968The Enterprise reaches a Federation colony where the adults have all killed t...
5. Is There in Truth No Beauty?
Aired: Oct 18, 1968Lovely telepath Miranda is aide to Ambassador Kollos, in a box to stop insani...
6. Spectre of the Gun
Aired: Oct 25, 1968As punishment for ignoring their warning and trespassing on their planet, the...
7. Day of the Dove
Aired: Nov 1, 1968Both humans and Klingons have been lured to a planet by a formless entity tha...
8. For the World Is Hollow and I Have Touched the Sky
Aired: Nov 8, 1968The Enterprise discovers an apparent asteroid that is on a collision course w...
9. The Tholian Web
Aired: Nov 15, 1968With Capt. Kirk and the derelict USS Defiant apparently lost, the Enterprise ...
10. Plato's Stepchildren
Aired: Nov 22, 1968After Dr. McCoy helps the leader of a planet populated by people with powerfu...
11. Wink of an Eye
Aired: Nov 29, 1968A group of aliens who exist in a state of incredible acceleration invade the ...
12. The Empath
Aired: Dec 6, 1968Trapped in an alien laboratory, Kirk, Spock and McCoy meet an empath and are ...
13. Elaan of Troyius
Aired: Dec 20, 1968While transporting an arrogant, demanding princess for a political marriage, ...
14. Whom Gods Destroy
Aired: Jan 3, 1969Kirk and Spock are taken prisoners by a former starship captain named Garth, ...
15. Let That Be Your Last Battlefield
Aired: Jan 10, 1969The Enterprise encounters two duo-chromatic and mutually belligerent aliens w...
16. The Mark of Gideon
Aired: Jan 17, 1969Kirk beams down to the planet Gideon and appears to find himself trapped on a...
17. That Which Survives
Aired: Jan 24, 1969After the Enterprise landing party beams down to investigate a geologically i...
18. The Lights of Zetar
Aired: Jan 31, 1969A mysterious, twinkling mass of sapient energy ravages an important archive a...
19. Requiem for Methuselah
Aired: Feb 14, 1969On a planet, looking for an urgent medicinal cure, Kirk, Spock and McCoy come...
20. The Way to Eden
Aired: Feb 21, 1969A group of idealistic hippies, led by an irrational leader, come aboard the U...
21. The Cloud Minders
Aired: Feb 28, 1969Kirk and Spock are caught up in a revolution on a planet where intellectuals ...
22. The Savage Curtain
Aired: Mar 7, 1969Kirk, Spock, Abraham Lincoln and Vulcan legend Surak are pitted in battle aga...
23. All Our Yesterdays
Aired: Mar 14, 1969When Kirk, Spock and McCoy investigate the disappearance of a doomed planet's...
24. Turnabout Intruder
Aired: Jun 3, 1969Captain Kirk's insane ex-lover Dr. Janice Lester forcibly switches bodies wit...