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
as John Borden
Nancy Gates
as Garnet
Rod Taylor
as Herbert Ellis
Lisa Montell
as Deena
Nelson Leigh
as Dr Eldon Galbraithe
Christopher Dark
as Henry Jaffe
Everett Glass
as Timmek
Booth Colman
as Mories
Shirley Patterson
as Elaine
Stanley Fraser
as Elda
William Vedder
as James (uncredited)
Mickey Simpson
as Naga (uncredited)
