- Noah Beery
- Capt. John Holling
- Astrid Allwyn
- Lila Kane
- Edwin Maxwell
- Major Pope
- Gustav von Seyffertitz
- Inspector Von Kessling
- Ralph Lewis
- Prof. Grimson
- Cornelius Keefe
- First Officer Cliff Rogers
- Zeffie Tilbury
- Granny Plimpton
- Boothe Howard
- Capt. Downey
- Howard Hickman
- Dr. Howard
- Jerry Stewart
- Edgar Morton
- George 'Gabby' Hayes
- Joe, the watchman
- George Cleveland
- Simms the Steward
- John M. Sullivan
- Watson
- Raymond Brown
- Spy Chief
- Gordon De Main
- Cmdr. Bryson
- Olaf Hytten
- Grimson's Aide
- George Nash
- Waiter
- Harry Schultz
- Aide
- Slim Whitaker
- Crewman
