| Title | Season Episode | Airdate | Stardate | Year | Rating | |
| Beyond the Farthest Star | 1 x 01 | 1 | 8 Sep 1973 | 5221.3 | 2268 |  |
| One of Our Planets Is Missing | 1 x 03 | 3 | 22 Sep 1973 | 5371.3 | 2268 | |
| The Survivor | 1 x 06 | 6 | 13 Oct 1973 | 5143.3 | 2268 | |
| Once Upon A Planet | 1 x 09 | 9 | 3 Nov 1973 | 5591.2 | 2268 | |
| The Eye of the Beholder | 1 x 15 | 15 | 5 Jan 1974 | 5501.2 | 2268 | |
| The Pirates of Orion | 2 x 17 | 17 | 7 Sep 1974 | 6334.1 | 2269 | |
| Bem | 2 x 18 | 18 | 14 Sep 1974 | 7403.6 | 2269 | |
| The Practical Joker | 2 x 19 | 19 | 21 Sep 1974 | 3183.3 | 2267 | |
| How Sharper Than a Serpent's Tooth | 2 x 21 | 21 | 5 Oct 1974 | 6063.4 | 2269 | |
| The Counter-Clock Incident | 2 x 22 | 22 | 12 Oct 1974 | 6770.3 | 2269 | |
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