Four astronauts returning from man's first mission to Mars enter a time warp and crash on a 26th Century Earth devastated by atomic war. At first unaware where they are, but finding the atmosphere safe to breathe, they start exploring and find themselves in a divided future where disfigured mutants living like cavemen inhabit the surface, while the normals live comfortably below the surface but are dying as a race from lack of natural water, air and sunlight.
| Sound | Leith Stevens | Original Music Composer |
| Editing | Eda Warren | Editor |
| Production | Richard G. Heermance | Producer |
| Directing | Edward Bernds | Director |
| Writing | Edward Bernds | Screenplay |
| Camera | Ellsworth Fredericks | Director of Photography |
| Art | Dave Milton | Art Direction |
| Camera | Harry Lewis | Grip |
