| Title | Season Episode | Airdate | Stardate | Year | Rating | |
| All Our Yesterdays | 3 x 23 | 79 | 14 Mar 1969 | 5943.7 | 2269 |  |
| Requiem for Methuselah | 3 x 21 | 77 | 14 Feb 1969 | 5843.7 | 2269 | |
| The Cloud Minders | 3 x 19 | 75 | 28 Feb 1969 | 5818.4 | 2269 | |
| Plato's Stepchildren | 3 x 12 | 68 | 22 Nov 1968 | 5784 | 2268 | |
| The Tholian Web | 3 x 09 | 65 | 15 Nov 1968 | 5693.2 | 2268 | |
| The Empath | 3 x 08 | 64 | 6 Dec 1968 | 5121 | 2268 | |
| Is There in Truth no Beauty? | 3 x 07 | 63 | 18 Oct 1968 | 5630.7 | 2268 | |
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