![]() | Lunar colonists of Moonbase Alpha are marooned in space after a nuclear explosion pushes the Moon out of its orbit and a rescue spaceship from the Earth is not what it seems to be. |
| Martin Landau | - | Commander John Koenig |
| Barbara Bain | - | Dr. Helena Russell |
| Catherine Schell | - | Maya |
| Tony Anholt | - | Tony Verdeshi |
| Nick Tate | - | Alan Carter |
| Zienia Merton | - | Sandra Benes |
| Jeffery Kissoon | - | Dr. Ben Vincent |
| Toby Robins | - | Diana Morris |