Sally Eilers

Claire Martel

Donald Woods

Joel Grant / Joseph Elmer

Eduardo Ciannelli

Dr. Victor Martel

Victor Kilian

Guissart

Charles Halton

Commandant

Dick Curtis

Jules

John Tyrrell

Gerault

Eddie Laughton

Brisson

Edmund Cobb

Quarry Guard

Robert Warwick

Governor

Lloyd Bridges

Rene (uncredited)

Byron Foulger

Presidente Judge (uncredited)