Arthur Franz

Dr. Jim Barker

Virginia Huston

Carol Stafford

Cameron Mitchell

Steve Abbott

John Litel

Dr. Lane

Richard Gaines

Prof. Jackson

Morris Ankrum

Ikron

Marguerite Chapman

Alita

Robert Barrat

Tillamar

Edward Earle

Justin (uncredited)

William Forrest

General (uncredited)

David Bond

Ramay (uncredited)

Stanley Blystone

Councilman (uncredited)

Tristram Coffin

Commentator (uncredited)

Everett Glass

Montar (uncredited)