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- Season 1 overviewSep 8, 1966-Apr 13, 196729 episodesSeason 1 episodes1. The Man Trap Sep 8, 1966
- While visiting M-113, Dr. McCoy runs into an old love and discovers that she has not aged a day.
- 2. Charlie X Sep 15, 1966
- Charlie Evans threatens the security of the ship when he exhibits deadly powers.
- 3. Where No Man Has Gone Before Sep 22, 1966
- Crew members develop god-like ESP capabilities while searching for missing ship.
- 4. The Naked Time Sep 29, 1966
- The crew is infected with a virus that causes them to behave irrationally.
- 5. The Enemy Within Oct 6, 1966
- Capt. Kirk is split into two physical beings, one hostile, the other beneficent.
- 6. Mudd's Women Oct 13, 1966
- Harry Mudd and his women are captured while trying to evade the Enterprise.
- 7. What Are Little Girls Made Of? Oct 20, 1966
- The Enterprise arrives at Exo III to learn the fate of Dr. Roger Korby.
- 8. Miri Oct 27, 1966
- A planet's experiment to prolong life leads to death for the adult population.
- 9. Dagger of the Mind Nov 3, 1966
- A prominent doctor from a penal colony smuggles himself on board the Enterprise.
- 10. The Corbomite Maneuver Nov 10, 1966
- Capt. Kirk is forced to bluff his way out of a dangerous situation.
- 11. The Menagerie Nov 17, 1966
- Mr. Spock demands a court-martial after kidnapping Capt. Pike from the hospital.
- 12. The Menagerie Nov 24, 1966
- Mr. Spock conducts his own defense as he faces charges of kidnapping and piracy.
- 13. The Conscience of the King Dec 8, 1966
- Kirk investigates the suspicious similarity between an actor and a mass executioner believed dead.
- 14. Balance of Terror Dec 15, 1966
- The Enterprise plays a game of cat-and-mouse with a cloaked Romulan warbird.
- 15. Shore Leave Dec 29, 1966
- The crew takes shore leave on an Earth-like planet where fantasies come to life.
- 16. The Galileo Seven Jan 5, 1967
- The crew of the Galileo fight for survival after crash landing on barren planet.
- 17. The Squire of Gothos Jan 12, 1967
- Capt. Kirk plays a game of death with a maniacal alien who toys with the ship.
- 18. Arena Jan 19, 1967
- Kirk is forced into a deadly showdown with the captain of an alien starship.
- 19. Tomorrow Is Yesterday Jan 26, 1967
- The Enterprise is thrown back in time and is mistaken for a UFO.
- 20. Court Martial Feb 2, 1967
- Capt. Kirk faces a court-martial over the apparent death of a fellow crewman.
- 21. Return of the Archons Feb 9, 1967
- While on Beta 3000, Capt. Kirk discovers a society ruled by the will of Landru.
- 22. Space Seed Feb 16, 1967
- The Enterprise encounters a derelict ship with 72 bodies in suspended animation.
- 23. A Taste of Armageddon Feb 23, 1967
- The Enterprise is declared destroyed in a planet's ongoing war with a neighbor.
- 24. This Side of Paradise Mar 2, 1967
- Capt. Kirk is surprised to find the colonists of an agricultural planet alive.
- 25. The Devil in the Dark Mar 9, 1967
- The Enterprise goes to the mining planet of Janus Six to investigate deaths.
- 26. Errand of Mercy Mar 16, 1967
- The Enterprise is sent to Organia to thwart an invasion by the Klingon Empire.
- 27. The Alternative Factor Mar 23, 1967
- The crew encounters a man on the run from his alter ego in a parallel universe.
- 28. The City on the Edge of Forever Apr 6, 1967
- Kirk and Spock follow drug-crazed McCoy through a time vortex to 1930s Earth; guest Joan Collins.
- 29. Operation -- Annihilate! Apr 13, 1967
- Parasitic invaders on Deneva kill Capt. Kirk's brother and attack Spock.