| Title | Season Episode | Airdate | Stardate | Year | Rating | |
| The Cage | 1 x 01 | 1 | 27 Nov 1988 | 2713.5 | 2259 |  |
| Where No Man Has Gone Before | 1 x 02 | 2 | 22 Sep 1966 | 1312.4 | 2265 | |
| The Enemy Within | 1 x 05 | 5 | 6 Oct 1966 | 1672.1 | 2266 | |
| The Man Trap | 1 x 06 | 6 | 8 Sep 1966 | 1513.1 | 2266 | |
| The Naked Time | 1 x 07 | 7 | 29 Sep 1966 | 1704.2 | 2266 | |
| Miri | 1 x 12 | 12 | 27 Oct 1966 | 2713.5 | 2266 | |
| Court Martial | 1 x 15 | 15 | 2 Feb 1967 | 2947.3 | 2267 | |
| This Side of Paradise | 1 x 26 | 26 | 2 Mar 1967 | 3417.3 | 2267 | |
| Operation: Annihilate! | 1 x 30 | 30 | 13 Apr 1967 | 3287.2 | 2267 | |
| The Deadly Years | 2 x 11 | 41 | 8 Dec 1967 | 3478.2 | 2267 | |
| Bread and Circuses | 2 x 14 | 44 | 15 Mar 1968 | 4040.7 | 2267 | |
| The Gamesters of Triskelion | 2 x 17 | 47 | 5 Jan 1968 | 3211.7 | 2268 | |
| The Immunity Syndrome | 2 x 19 | 49 | 19 Jan 1968 | 4307.1 | 2268 | |
| Return to Tomorrow | 2 x 22 | 52 | 9 Feb 1968 | 4768.3 | 2268 | |
| Is There in Truth no Beauty? | 3 x 07 | 63 | 18 Oct 1968 | 5630.7 | 2268 | |
| The Empath | 3 x 08 | 64 | 6 Dec 1968 | 5121 | 2268 | |
| The Tholian Web | 3 x 09 | 65 | 15 Nov 1968 | 5693.2 | 2268 | |
| Plato's Stepchildren | 3 x 12 | 68 | 22 Nov 1968 | 5784 | 2268 | |
| The Cloud Minders | 3 x 19 | 75 | 28 Feb 1969 | 5818.4 | 2269 | |
| Requiem for Methuselah | 3 x 21 | 77 | 14 Feb 1969 | 5843.7 | 2269 | |
| All Our Yesterdays | 3 x 23 | 79 | 14 Mar 1969 | 5943.7 | 2269 | |
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