Michael Whalen
Robert Norton
Acting
Anne Nagel
Nancy Fielding
Acting
William Bakewell
Tom Fielding
Acting
Constance Worth
Linda Pavlo
Acting
Hans Heinrich von Twardowski
Capt. Gemmler
Acting
Jack Mulhall
Chief Agent James Curtis
Acting
George Pembroke
Prof. Karl Schmidt
Acting
Kenneth Harlan
Agent Brown
Acting
Robert Frazer
John Oliver
Acting
Hans von Morhart
Heinrich
Acting
Michael Vallon
Argus
Acting
Willy Castello
Otto
Acting
C. Montague Shaw
Franklin Prescott (uncredited)
Acting
Poppy Wilde
Restaurant Patron (uncredited)
Acting