Astronauts blast off to explore the moon on Rocketship X-M or "Rocketship eXploration Moon". A spacecraft malfunction and some fuel miscalculations cause them to end up landing on Mars. On Mars, evidence of a once powerful civilization is found. The scientists determined that an atomic war destroyed most of the Martians. Those that survived reverted to a caveman like existence.
Lloyd Bridges
Osa Massen
John Emery
Noah Beery Jr.
Hugh O'Brian
Morris Ankrum
Patrick Aherne
Sherry Moreland
John Dutra
Kathy Marlowe
Tom Coleman
James Conaty
Sam Harris
Judd Holdren
Stuart Holmes
Barry Norton
Cosmo Sardo
Bert Stevens