| Title | Season Episode | Airdate | Stardate | Year | Rating | |
| Wolf in the Fold | 2 x 07 | 37 | 22 Dec 1967 | 3614.9 | 2267 |  |
| The Changeling | 2 x 08 | 38 | 29 Sep 1967 | 3541.9 | 2267 | |
| Journey to Babel | 2 x 15 | 45 | 17 Nov 1967 | 3842.3 | 2267 | |
| Obsession | 2 x 18 | 48 | 15 Dec 1967 | 3619.2 | 2268 | |
| The Ultimate Computer | 2 x 24 | 54 | 8 Mar 1968 | 4729.4 | 2268 | |
| The Omega Glory | 2 x 25 | 55 | 1 Mar 1968 | Unknown | 2268 | |
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