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Amok Time

Episode number: 1

Overview: First Officer Spock returns to his home world for a brutal Vulcan mating ritual.

Who Mourns for Adonais?

Episode number: 2

Overview: The crew of the Enterprise are held captive by an alien who turns out to be the Greek god Apollo.

The Changeling

Episode number: 3

Overview: The crew of the USS Enterprise deals with an indestructible planet-destroying space probe.

Mirror, Mirror

Episode number: 4

Overview: 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.

The Apple

Episode number: 5

Overview: The crew of the Enterprise visits a mysterious paradisical planet controlled by a computer that is served by the local inhabitants.

The Doomsday Machine

Episode number: 6

Overview: 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.

Catspaw

Episode number: 7

Overview: Two powerful aliens threaten the well-being of the Enterprise and her crew.

I, Mudd

Episode number: 8

Overview: 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.

Metamorphosis

Episode number: 9

Overview: A shuttle crew from the USS Enterprise encounters a man out of history and his mysterious alien companion.

Journey to Babel

Episode number: 10

Overview: The Enterprise must transport dignitaries to a peace conference, with an assassin on the loose.

Friday's Child

Episode number: 11

Overview: The crew of the Enterprise become entangled in a planet's tribal power struggle.

The Deadly Years

Episode number: 12

Overview: Strange radiation exposes the command crew of the Enterprise to the effects of rapid aging.

Obsession

Episode number: 13

Overview: Captain James T. Kirk becomes obsessed with destroying a deadly entity he once encountered in his youth.

Wolf in the Fold

Episode number: 14

Overview: A series of bizarre murders points to Mr. Scott as the prime suspect.

The Trouble With Tribbles

Episode number: 15

Overview: The Enterprise must protect a very important shipment of grain from both Klingons and some adorable creatures called tribbles.

The Gamesters of Triskelion

Episode number: 16

Overview: Captain Kirk and his companions are abducted into slavery and trained to fight as gladiators for the gambling entertainment of three disembodied beings.

A Piece of the Action

Episode number: 17

Overview: The Enterprise visits a planet with an Earth-like 1920s gangster culture.

The Immunity Syndrome

Episode number: 18

Overview: The crew of the Enterprise encounters an energy-draining field which may be able to destroy the galaxy.

A Private Little War

Episode number: 19

Overview: 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.

Return to Tomorrow

Episode number: 20

Overview: Ancient alien minds are given control of Captain Kirk's and First Officer Spock's bodies.

Patterns of Force

Episode number: 21

Overview: The crew of the Enterprise tracks down a Federation observer on a planet dominated by a "Naziesque" regime.

By Any Other Name

Episode number: 22

Overview: Beings from another galaxy commandeer the Enterprise in an attempt to return home.

The Omega Glory

Episode number: 23

Overview: Captain Kirk must find the cure to a deadly disease and put an end to another Starfleet captain's cultural interference.

The Ultimate Computer

Episode number: 24

Overview: A skeleton Enterprise crew are assigned to test a revolutionary computer system that is given total control of the ship.

Bread and Circuses

Episode number: 25

Overview: The Enterprise crew investigates the disappearance of a ship's crew on a planet that is a modern version of the Roman Empire.

Assignment: Earth

Episode number: 26

Overview: While back in time observing Earth in 1968, the Enterprise crew encounters the mysterious Gary Seven who has his own agenda on the planet.