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
as Colonel Floyd Graham
Osa Massen
as Dr. Lisa Van Horn
John Emery
as Dr. Karl Eckstrom
Noah Beery Jr.
as Major William Corrigan
Hugh O'Brian
as Harry Chamberlain
Morris Ankrum
as Dr. Ralph Fleming
Patrick Aherne
as Reporter #1
Sherry Moreland
as Martian girl
John Dutra
as Physician
Kathy Marlowe
as Reporter
Tom Coleman
as Reporter (uncredited)
James Conaty
as Doctor Taking Lisa's Blood Pressure (uncredited)
