A team of American astronauts leave their space station on the first mission to Mars, but the captain's religious beliefs may get in the way.
Walter Brooke
as Gen. Samuel T. Merritt
Eric Fleming
as Capt. Barney Merritt
Mickey Shaughnessy
as Sgt. Mahoney
Phil Foster
as Jackie Siegle
William Redfield
as Roy Cooper
William Hopper
as Dr. George Fenton
Benson Fong
as Imoto
Ross Martin
as Andre Fodor
Vito Scotti
as Sanella
John Dennis
as Donkersgoed
Michael Fox
as Elsbach
Joan Shawlee
as Rosie McCann
