- William Gargan
- Agent Larry Cameron
- Maria Palmer
- Greta Holvig
- Patrick O'Moore
- Agent George Timothy
- Herman Bing
- Herr Schmidt
- Kay Connors
- Kay
- Kurt Katch
- Dr. Heligmann
- David Leonard
- Prof. Gustav Kleinheldt
- John Bleifer
- Becker
- Henry Rowland
- Otto Manfred
- George Sorel
- Dr. Zarig
- Eilene Janssen
- Anchaka Schmidt
- Jimmy Aubrey
- Omnibus Conductor
- John Banner
- Ernst - Nazi Henchman
- Bernard Berg
- Hans Zeidler
- Frederic Brunn
- Nazi Headquarters Radioman
- George M. Carleton
- Milford
- John Dehner
- Harris
- Leslie Denison
- Agent Clark
- Angela DeWitt
- Frau Zinderhoff
- Betty Fairfax
- Cigarette Counter Clerk
- Douglas Fowley
- Chief Agent Hanover
- Arno Frey
- Kutner
- Gil Frye
- Agent Redding
- Jon Gilbreath
- Agent Lindsey
- Art Gilmore
- Agent Thompson / Narrator (uncredited)
- Gary Gray
- 'Hansel' in Radio Show
- Ilka Grüning
- Frau Schmidt
- Ann Harper
- Radio Voice
- Leyland Hodgson
- Agent Benson
- Boyd Irwin
- Brig. Gen. Carstairs
- Charles Knight
- Customs Inspector
- Paul Kruger
- Leopold - Nazi Forger
- Castle McCall
- Radio Voice
- Charles Miller
- Dr. Upton
- Clifford Moore
- Chubby Man
- Otto Reichow
- Sigmund
- Bert Roach
- Herr Kompenik
- Marin Sais
- Rina - Heligmann's Housekeeper
- Frieda Stoll
- Frau Kompenik
- Hans Tanzler
- Herr Zinderhoff
- Ferris Taylor
- Senator Bradley
- Evan Thomas
- Sinclair - Carstairs' Aide
- Emmett Vogan
- Griswold
- Claude Wisberg
- English Radio Operator
