
Season 1
Episodes

1. The Man Trap
1966-09-08
Kirk and his crew are at deadly risk from an alien creature that feeds on the salt in a human body and can take on any form.

2. Charlie X
1966-09-15
Charlie Evans, the sole survivor of a transport crash, is transferred to the Enterprise from a different ship. Why are they so eager to rid themselves of him, though? There's more to Charlie than meets the eye...

3. Where No Man Has Gone Before
1966-09-22
While exploring the edge of the galaxy, the Enterprise encounters an energy barrier that gives some crewmen strange powers.

4. The Naked Time
1966-09-29
A strange alien substance causes the crew to lose their inhibitions.

5. The Enemy Within
1966-10-06
A transporter malfunction causes Captain Kirk to split into his "good" and "evil" selves, and a landing party will freeze to death if they don't merge the two back together.

6. Mudd's Women
1966-10-13
The Enterprise picks up a intergalactic conman, Harry Mudd, and three incredibly beautiful women who harbor a dark secret.

7. What Are Little Girls Made Of?
1966-10-20
Nurse Christine Chapel is reunited with her old fiance on Exo III, but the scientist has plans for Captain Kirk and the Federation.

8. Miri
1966-10-27
Kirk and a landing party are stranded on a planet due to a disease that causes any adult to die a painful death, and must deal with the local children who have survived.

9. Dagger of the Mind
1966-11-03
Kirk investigates an experimental facility for holding prisoners and finds a sinister scheme.

10. The Corbomite Maneuver
1966-11-10
The Enterprise encounters a vast alien ship that threatens the Enterprise with destruction.

11. The Menagerie (1)
1966-11-17
Spock kidnaps his former captain, the crippled Christopher Pike, and heads for a quarantined planet, putting his career and Kirk's life on the line.

12. The Menagerie (2)
1966-11-24
Spock's court-martial continues as he attempts to justify his abduction of Pike, the theft of the Enterprise, and his heading for a planet declared forbidden by Starfleet.

13. The Conscience of the King
1966-12-08
Kirk is one of the last survivors who can identify a mass killer, who lurks among a Shakespearean troupe aboard the Enterprise.

14. Balance of Terror
1966-12-15
Kirk pits the Enterprise against an invisible spaceship testing the Federation's defenses.

15. Shore Leave
1966-12-29
The Enterprise crew take shore leave on a peaceful, pastoral planet... where their dreams and fantasies come to life.

16. The Galileo Seven
1967-01-05
Spock commands a stranded away team when their shuttlecraft crash lands on a planet with hostile natives.

17. The Squire of Gothos
1967-01-12
The Enterprise finds itself at the mercy of a seemingly omnipotent being who fancies himself an 18th century Englishman.

18. Arena
1967-01-19
When a mysterious alien race destroy an Earth colony, the Enterprise pursues, but Kirk and the alien captain are forced to fight each other by powerful aliens.

19. Tomorrow Is Yesterday
1967-01-26
In a freak accident the Enterprise is sent back to 20th century Earth, and must find their way back without changing history.

20. Court Martial
1967-02-02
Captain Kirk's career is at stake when he is put on trial for the loss of a crewman during an ion storm.

21. The Return of the Archons
1967-02-09
The Enterprise encounters a seemingly peaceful civilization run by a "benevolent" being named Landru... who intends for them to join his people.

22. Space Seed
1967-02-16
The Enterprise picks up a crew of genetic supermen from the 20th century... and their leader, Khan, plans to create a new empire.

23. A Taste of Armageddon
1967-02-23
The Enterprise arrives at a planet to establish diplomatic relations and finds itself in the middle of a "peaceful" war that threatens to destroy the ship.

24. This Side of Paradise
1967-03-02
The Enterprise crew try to rescue colonists from deadly radiation, but instead encounter strange alien spores that seem to offer paradise.

25. The Devil in the Dark
1967-03-09
Kirk investigates a series of grisly murders on a mining planet that are the work of a seemingly hostile alien creature.

26. Errand of Mercy
1967-03-23
The Federation and the Klingon Empire teeter on the brink of war as Kirk investigates Organia, a humble planet, inhabited by pacifists, that is unwittingly caught in the middle.

27. The Alternative Factor
1967-03-30
Kirk and Spock encounter an alien named Lazarus who claims to be from an anti-matter universe.

28. The City on the Edge of Forever
1967-04-06
Kirk and Spock must travel into the past in order to correct a change that will alter history.

29. Operation: Annihilate!
1967-04-13
Kirk and the Enterprise must combat parasitic aliens threatening the lives of millions.