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.
        
        
                
            Directed by:
                        Edward Bernds                    
        
                
            Starring:
                        Hugh Marlowe,                        Nancy Gates,                        Rod Taylor,                        Lisa Montell,                        Nelson Leigh,                        Christopher Dark