| Title | Season Episode | Airdate | Stardate | Year | Rating | |
| Balance of Terror | 1 x 09 | 9 | 15 Dec 1966 | 1709.2 | 2266 |  |
| The Menagerie, Part 2 | 1 x 17 | 17 | 24 Nov 1966 | 3013.1 | 2267 | |
| Shore Leave | 1 x 18 | 18 | 29 Dec 1966 | 3025.3 | 2267 | |
| Arena | 1 x 20 | 20 | 19 Jan 1967 | 3045.6 | 2267 | |
| Space Seed | 1 x 25 | 25 | 16 Feb 1967 | 3141.9 | 2267 | |
| The Devil in the Dark | 1 x 27 | 27 | 9 Mar 1967 | 3196.1 | 2267 | |
| Errand of Mercy | 1 x 28 | 28 | 23 Mar 1967 | 3198.4 | 2267 | |
| The City on the Edge of Forever | 1 x 29 | 29 | 6 Apr 1967 | 3134 | 2267 | |
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