The first manned expedition to Mars is invaded by an unknown life form, which stows away on the rescue ship.
Marshall Thompson
as Carruthers
Shirley Patterson
as Ann Anderson
Kim Spalding
as Van Heusen
Ann Doran
as Mary Royce
Dabbs Greer
as Eric Royce
Paul Langton
as Calder
Robert Bice
as Purdue
Richard Benedict
as Bob Finelli
Richard Hervey
as Gino
Thom Carney
as Kienholz
John Chard
It has to kill us or starve and we've got to kill it or die. It's the future, 1973, and the first manned expedition to Mars is marooned. When a rescue team finally reach the stricken ship they find only one survivor - the leader, Col. Edward Carruthers. He claims that an alien life form killed h...