Les Creatures de Kolos

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

John Indrisano

— Thor, the Butler

Ted Durant

— The Galaxy Being

Tommy Leonetti

— Reporter (uncredited)

Walter Maslow

Larry Barton

Lori Lyons

Benito Prezia

Margaret Teele

— Blonde Lab Assistant

Alean 'Bambi' Hamilton

— Brunette Lab Assistant

Walter Abel

— Dr. Munson

Lon Satton

Mel Ruick

— Dr. Munson (as Melville Ruick)

Kim Satana

— Dr. Lin Yung

John Dasten

— (as John Daston)

Richard Schuyler

William White

— (as Bill Hampton)

Andrew Johnson

— (Uncredited)