Calificación
Reparto

Michael Whalen
Robert Norton

Anne Nagel
Nancy Fielding

William Bakewell
Tom Fielding

Constance Worth
Linda Pavlo

Hans Heinrich von Twardowski
Capt. Gemmler

Jack Mulhall
Chief Agent James Curtis

George Pembroke
Prof. Karl Schmidt

Kenneth Harlan
Agent Brown

Robert Frazer
John Oliver

Hans von Morhart
Heinrich

Michael Vallon
Argus

Willy Castello
Otto

C. Montague Shaw
Franklin Prescott (uncredited)

Poppy Wilde
Restaurant Patron (uncredited)