Cuando un alienígena sin identificar destruye tres poderosas naves Klingon el capitán James T. Kirk vuelve a tomar el mando de la completamente reformada nave Enterprise.
 | William Shatner | James T. Kirk |
| Leonard Nimoy | Spock |
| DeForest Kelley | Bones |
| James Doohan | Scotty |
| George Takei | Hikaru Sulu |
| Majel Barrett | Christine Chapel |
| Walter Koenig | Pavel Chekov |
| Nichelle Nichols | Uhura |
| Persis Khambatta | Ilia |
 | Stephen Collins | Willard Decker |
| Grace Lee Whitney | Janice Rand |
| David Gautreaux | Branch |
