Noah Beery

Character: Capt. John Holling

Astrid Allwyn

Character: Lila Kane

Edwin Maxwell

Character: Major Pope

Gustav von Seyffertitz

Character: Inspector Von Kessling

Ralph Lewis

Character: Prof. Grimson

Cornelius Keefe

Character: First Officer Cliff Rogers

Zeffie Tilbury

Character: Granny Plimpton

Boothe Howard

Character: Capt. Downey

Howard Hickman

Character: Dr. Howard

Jerry Stewart

Character: Edgar Morton

John M. Sullivan

Character: Watson

George 'Gabby' Hayes

Character: Joe, the Watchman

George Cleveland

Character: Simms, the Steward

Raymond Brown

Character: Spy Chief (uncredited)

Gordon De Main

Character: Commander Bryson (uncredited)

Olaf Hytten

Character: Grimson's Aide (uncredited)

George Nash

Character: Waiter (uncredited)

Harry Schultz

Character: Aide (uncredited)

Slim Whitaker

Character: Crewman (uncredited)