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