Mark Dana as Capt. Storm

Diane Brewster as Sylvia Quentin

Ziva Rodann as Simira

Alvaro Guillot as Numar

George N. Neise as Robert Quentin

Ben Wright as Walter Andrews

Terence de Marney as Sgt. Smolett

Richard Peel as Sgt. Gromley

Guy Prescott as Dr. Michael Farraday

Kurt Katch as Hans Brecht

Robert Fortin as Claude Beauchamp

Ralph Clanton as Col. Cross