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.
Hugh Marlowe
John Borden
Nancy Gates
Garnet
Rod Taylor
Herbert Ellis
Lisa Montell
Deena
Nelson Leigh
Dr Eldon Galbraithe
Christopher Dark
Henry Jaffe
Everett Glass
Timmek
Booth Colman
Mories
