Astronauts returning from a voyage to Mars are caught in a time warp and are propelled into a post-Apocalyptic Earth populated by mutants.
Mediocre, but mildy entertaining sci-fi yarn; lots of laughable moments, the audacity to 'civilize' a 500 years advanced society with 50s machismo included.
Halliwell (no star): "Reasonably lively sci-fi with horror elements, and a plot borrowed from H.G. Wells."
Maltin**1/2: "Pretty good sci-fi owes more than a little to H.G. Wells' The Time Machine."