| Title | Original Air Date | Stardate |
|---|---|---|
| Season 1 | ||
| Beyond the Farthest Star | 9/8/73 | 5521.3 |
| Yesteryear | 9/15/73 | 5373.4 |
| One of Our Planets is Missing | 9/22/73 | 5371.3 |
| The Lorelei Signal | 9/29/73 | 5483.7 |
| More Troubles, More Tribbles | 10/6/73 | 5329.4 |
| The Survivor | 10/13/73 | 5143.3 |
| The Infinite Vulcan | 10/20/73 | 5554.4 |
| The Magicks of Megus-Tu | 10/27/73 | 1254.4 |
| Once Upon A Planet | 11/3/73 | 5591.2 |
| Mudd's Passion | 11/10/73 | 4978.5 |
| The Terratin Incident | 1/17/73 | 5577.3 |
| Time Trap | 11/24/73 | 5267.2 |
| The Ambergris Element | 12/1/73 | 5499.9 |
| Slaver Weapon | 12/15/73 | 4187.3 |
| The Eye of the Beholder | 1/5/74 | 5501.2 |
| The Jihad | 1/12/74 | 5683.1 |
| Season 2 | ||
| The Pirates of Orion | 9/7/74 | 6334.1 |
| Bem | 9/14/74 | 7403.6 |
| The Practical Joker | 9/21/74 | 3183.3 |
| Albatross | 9/28/74 | 5275.6 |
| How Sharper Than A Serpent's Tooth | 10/5/74 | 6063.4 |
| The Counter-Clock Incident | 10/12/74 | 6770.3 |