- 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
- Ted Adams
- Sullivan
- John Barton
- Tavern Patron
- Charles Calvert
- Headwaiter
- Jack Cheatham
- Max
- Jack Deery
- Tavern Patron
- Jack Gardner
- Nazi Spy
- George Burr MacAnnan
- Wolf
- Frank Mayo
- Detective
- George Morrell
- Waiter
- Sol Murgi
- Tavern Patron
- Paul Power
- Tavern Patron
- Betty Roadman
- Mother Fielding
- Cosmo Sardo
- Tavern Patron
- C. Montague Shaw
- Franklin Prescott
- Rudolf Steinboeck
- Tavern Patron
- Crane Whitley
- Agent
- Poppy Wilde
- Tavern Patron
- William Yetter Sr.
- Heinrich's Partner
