2x1 15 Sept 1967 Amok Time First Officer Spock returns to his home world for a brutal Vulcan mating ritual. 2x2 22 Sept 1967 Who Mourns for Adonais? The crew of the Enterprise are held captive by an alien who turns out to be the Greek god Apollo. 2x3 29 Sept 1967 The Changeling The crew of the USS Enterprise deals with an indestructible planet-destroying space probe. 2x4 6 Oct 1967 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. 2x5 13 Oct 1967 The Apple The crew of the Enterprise visits a mysterious paradisical planet controlled by a computer that is served by the local inhabitants. 2x6 20 Oct 1967 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. 2x7 27 Oct 1967 Catspaw Two powerful aliens threaten the well-being of the Enterprise and her crew. 2x8 3 Nov 1967 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. 2x9 10 Nov 1967 Metamorphosis A shuttle crew from the USS Enterprise encounters a man out of history and his mysterious alien companion. 2x10 17 Nov 1967 Journey to Babel The Enterprise must transport dignitaries to a peace conference, with an assassin on the loose. 2x11 1 Dec 1967 Friday's Child The crew of the Enterprise become entangled in a planet's tribal power struggle. 2x12 8 Dec 1967 The Deadly Years Strange radiation exposes the command crew of the Enterprise to the effects of rapid aging. 2x13 15 Dec 1967 Obsession Captain James T. Kirk becomes obsessed with destroying a deadly entity he once encountered in his youth. 2x14 22 Dec 1967 Wolf in the Fold A series of bizarre murders points to Mr. Scott as the prime suspect. 2x15 29 Dec 1967 The Trouble With Tribbles The Enterprise must protect a very important shipment of grain from both Klingons and some adorable creatures called tribbles. 2x16 5 Jan 1968 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. 2x17 12 Jan 1968 A Piece of the Action The Enterprise visits a planet with an Earth-like 1920s gangster culture. 2x18 19 Jan 1968 The Immunity Syndrome The crew of the Enterprise encounters an energy-draining field which may be able to destroy the galaxy. 2x19 2 Feb 1968 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. 2x20 9 Feb 1968 Return to Tomorrow Ancient alien minds are given control of Captain Kirk's and First Officer Spock's bodies. 2x21 16 Feb 1968 Patterns of Force The crew of the Enterprise tracks down a Federation observer on a planet dominated by a "Naziesque" regime. 2x22 23 Feb 1968 By Any Other Name Beings from another galaxy commandeer the Enterprise in an attempt to return home. 2x23 1 Mar 1968 The Omega Glory Captain Kirk must find the cure to a deadly disease and put an end to another Starfleet captain's cultural interference. 2x24 8 Mar 1968 The Ultimate Computer A skeleton Enterprise crew are assigned to test a revolutionary computer system that is given total control of the ship. 2x25 15 Mar 1968 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. 2x26 29 Mar 1968 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.