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.

• Lippert Pictures
• Lloyd Bridges
• Osa Massen
• John Emery
• Noah Beery Jr.
• Hugh O'Brian
• Morris Ankrum
• Patrick Aherne
• Sherry Moreland