Season 2
Episodes
1. Amok Time
1967-09-15
First Officer Spock returns to his home world for a brutal Vulcan mating ritual.
2. Who Mourns for Adonais?
1967-09-22
The crew of the Enterprise are held captive by an alien who turns out to be the Greek god Apollo.
3. The Changeling
1967-09-29
The crew of the USS Enterprise deals with an indestructible planet-destroying space probe.
4. Mirror, Mirror
1967-10-06
A transporter mishap swaps Captain Kirk and his companions with their evil counterparts in a parallel universe. In the so-called Mirror Universe, the Enterprise is a ship of the Terran Empire, an organization as evil as the United Federation of Planets is benevolent.
5. The Apple
1967-10-13
The crew of the Enterprise visits a mysterious paradisical planet controlled by a computer that is served by the local inhabitants.
6. The Doomsday Machine
1967-10-20
The starship Enterprise and its heavily-damaged sister ship, the USS Constellation, must work together to stop an alien planet-killing machine headed for the heart of Federation territory.
7. Catspaw
1967-10-27
Two powerful aliens threaten the well-being of the Enterprise and her crew.
8. I, Mudd
1967-11-03
Captain Kirk has a second run-in with the conman, Harry Mudd. Mudd is now the supreme ruler of a planet of androids who cater to his every whim.
9. Metamorphosis
1967-11-10
A shuttle crew from the USS Enterprise encounters a man out of history and his mysterious alien companion.
10. Journey to Babel
1967-11-17
The Enterprise must transport dignitaries to a peace conference, with an assassin on the loose.
11. Friday's Child
1967-12-01
The crew of the Enterprise become entangled in a planet's tribal power struggle.
12. The Deadly Years
1967-12-08
Strange radiation exposes the command crew of the Enterprise to the effects of rapid aging.
13. Obsession
1967-12-15
Captain James T. Kirk becomes obsessed with destroying a deadly entity he once encountered in his youth.
14. Wolf in the Fold
1967-12-22
A series of bizarre murders points to Mr. Scott as the prime suspect.
15. The Trouble With Tribbles
1967-12-29
The Enterprise must protect a very important shipment of grain from both Klingons and some adorable creatures called tribbles.
16. The Gamesters of Triskelion
1968-01-05
Captain Kirk and his companions are abducted into slavery and trained to fight as gladiators for the gambling entertainment of three disembodied beings.
17. A Piece of the Action
1968-01-12
The Enterprise visits a planet with an Earth-like 1920s gangster culture.
18. The Immunity Syndrome
1968-01-19
The crew of the Enterprise encounters an energy-draining field which may be able to destroy the galaxy.
19. A Private Little War
1968-02-02
The crew of the Enterprise discovers Klingon interference in the development of a formerly peaceful planet and is forced to help maintain a balance of power.
20. Return to Tomorrow
1968-02-09
Ancient alien minds are given control of Captain Kirk's and First Officer Spock's bodies.
21. Patterns of Force
1968-02-16
The crew of the Enterprise tracks down a Federation observer on a planet dominated by a "Naziesque" regime.
22. By Any Other Name
1968-02-23
Beings from another galaxy commandeer the Enterprise in an attempt to return home.
23. The Omega Glory
1968-03-01
Captain Kirk must find the cure to a deadly disease and put an end to another Starfleet captain's cultural interference.
24. The Ultimate Computer
1968-03-08
A skeleton Enterprise crew are assigned to test a revolutionary computer system that is given total control of the ship.
25. Bread and Circuses
1968-03-15
The Enterprise crew investigates the disappearance of a ship's crew on a planet that is a modern version of the Roman Empire.
26. Assignment: Earth
1968-03-29
While back in time observing Earth in 1968, the Enterprise crew encounters the mysterious Gary Seven who has his own agenda on the planet.