| Title | Season Episode | Airdate | Stardate | Year | Rating | |
| 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 | |
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