Episodes
Season 20/26episodes
- Episode 1— Amok TimeSep 15, 1967
- Episode 2— Who Mourns for Adonais?Sep 22, 1967
- Episode 3— The ChangelingSep 29, 1967
- Episode 4— Mirror, MirrorOct 6, 1967
- Episode 5— The AppleOct 13, 1967
- Episode 6— The Doomsday MachineOct 20, 1967
- Episode 7— CatspawOct 27, 1967
- Episode 8— I, MuddNov 3, 1967
- Episode 9— MetamorphosisNov 10, 1967
- Episode 10— Journey to BabelNov 17, 1967
- Episode 11— Friday's ChildDec 1, 1967
- Episode 12— The Deadly YearsDec 8, 1967
- Episode 13— ObsessionDec 15, 1967
- Episode 14— Wolf in the FoldDec 22, 1967
- Episode 15— The Trouble With TribblesDec 29, 1967
- Episode 16— The Gamesters of TriskelionJan 5, 1968
- Episode 17— A Piece of the ActionJan 12, 1968
- Episode 18— The Immunity SyndromeJan 19, 1968
- Episode 19— A Private Little WarFeb 2, 1968
- Episode 20— Return to TomorrowFeb 9, 1968
- Episode 21— Patterns of ForceFeb 16, 1968
- Episode 22— By Any Other NameFeb 23, 1968
- Episode 23— The Omega GloryMar 1, 1968
- Episode 24— The Ultimate ComputerMar 8, 1968
- Episode 25— Bread and CircusesMar 15, 1968
- Episode 26— Assignment: EarthMar 29, 1968
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