George Nader

Glenn Martin

Barbara Nichols

Gale Wilson

George Macready

Prof. Vaughn Dornheimer

Dolores Faith

Lisa Dornheimer

Hugh Beaumont

Austin Welles

Richard Arlen

National Intelligence

Richard Kiel

Dr. Kolos

Alean 'Bambi' Hamilton

Brunette Lab Assistant

Walter Abel

Dr. Munson

Lon Satton

Lon Satton

Reporter (uncredited)