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)