| Title | Season Episode | Airdate | Stardate | Year | Rating | |
| The Alternative Factor | 1 x 21 | 21 | 30 Mar 1967 | 3087.6 | 2267 |  |
| Catspaw | 2 x 01 | 31 | 27 Oct 1967 | 3018.2 | 2267 | |
| Spock's Brain | 3 x 06 | 62 | 20 Sep 1968 | 5431.4 | 2268 | |
| The Mark of Gideon | 3 x 17 | 73 | 17 Jan 1969 | 5423.4 | 2268 | |
| The Lights of Zetar | 3 x 18 | 74 | 31 Jan 1969 | 5725.3 | 2269 | |
| The Way to Eden | 3 x 20 | 76 | 21 Feb 1969 | 5832.3 | 2269 | |
| The Savage Curtain | 3 x 22 | 78 | 7 Mar 1969 | 5906.4 | 2269 | |
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