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Amok Time First Officer Spock returns to his home world for a brutal Vulcan mating ritual.
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Who Mourns for Adonais? The crew of the Enterprise are held captive by an alien who turns out to be the Greek god Apollo.
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The Changeling The crew of the USS Enterprise deals with an indestructible planet-destroying space probe.
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Mirror, Mirror 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.
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The Apple The crew of the Enterprise visits a mysterious paradisical planet controlled by a computer that is served by the local inhabitants.
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The Doomsday Machine 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.
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Catspaw Two powerful aliens threaten the well-being of the Enterprise and her crew.
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I, Mudd 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.
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Metamorphosis A shuttle crew from the USS Enterprise encounters a man out of history and his mysterious alien companion.
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Journey to Babel The Enterprise must transport dignitaries to a peace conference, with an assassin on the loose.
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Friday's Child The crew of the Enterprise become entangled in a planet's tribal power struggle.
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The Deadly Years Strange radiation exposes the command crew of the Enterprise to the effects of rapid aging.
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Obsession Captain James T. Kirk becomes obsessed with destroying a deadly entity he once encountered in his youth.
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Wolf in the Fold A series of bizarre murders points to Mr. Scott as the prime suspect.
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The Trouble With Tribbles The Enterprise must protect a very important shipment of grain from both Klingons and some adorable creatures called tribbles.
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The Gamesters of Triskelion Captain Kirk and his companions are abducted into slavery and trained to fight as gladiators for the gambling entertainment of three disembodied beings.
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A Piece of the Action The Enterprise visits a planet with an Earth-like 1920s gangster culture.
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The Immunity Syndrome The crew of the Enterprise encounters an energy-draining field which may be able to destroy the galaxy.
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A Private Little War 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.
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Return to Tomorrow Ancient alien minds are given control of Captain Kirk's and First Officer Spock's bodies.
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Patterns of Force The crew of the Enterprise tracks down a Federation observer on a planet dominated by a "Naziesque" regime.
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By Any Other Name Beings from another galaxy commandeer the Enterprise in an attempt to return home.
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The Omega Glory Captain Kirk must find the cure to a deadly disease and put an end to another Starfleet captain's cultural interference.
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The Ultimate Computer A skeleton Enterprise crew are assigned to test a revolutionary computer system that is given total control of the ship.
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Bread and Circuses The Enterprise crew investigates the disappearance of a ship's crew on a planet that is a modern version of the Roman Empire.
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Assignment: Earth While back in time observing Earth in 1968, the Enterprise crew encounters the mysterious Gary Seven who has his own agenda on the planet.