Obsession

1 Amok Time 2 Who Mourns for Adonais? 3 The Changeling 4 Mirror, Mirror 5 The Apple 6 The Doomsday Machine 7 Catspaw 8 I, Mudd 9 Metamorphosis 10 Journey to Babel 11 Friday's Child 12 The Deadly Years 13 Obsession 14 Wolf in the Fold 15 The Trouble With Tribbles 16 The Gamesters of Triskelion 17 A Piece of the Action 18 The Immunity Syndrome 19 A Private Little War 20 Return to Tomorrow 21 Patterns of Force 22 By Any Other Name 23 The Omega Glory 24 The Ultimate Computer 25 Bread and Circuses 26 Assignment: Earth