| Title | Season Episode | Airdate | Stardate | Year | Rating | |
| Amok Time | 2 x 05 | 35 | 15 Sep 1967 | 3372.7 | 2267 |  |
| The Doomsday Machine | 2 x 06 | 36 | 20 Oct 1967 | Unknown | 2267 | |
| Mirror, Mirror | 2 x 10 | 40 | 6 Oct 1967 | Unknown | 2267 | |
| The Trouble With Tribbles | 2 x 13 | 43 | 29 Dec 1967 | 4523.3 | 2267 | |
| A Private Little War | 2 x 16 | 46 | 2 Feb 1968 | 4211.4 | 2267 | |
| A Piece of the Action | 2 x 20 | 50 | 12 Jan 1968 | Unknown | 2268 | |
| By Any Other Name | 2 x 21 | 51 | 23 Feb 1968 | 4657.5 | 2268 | |
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