Mystery Liner

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

John M. Sullivan

Watson

George 'Gabby' Hayes

Joe, the Watchman

George Cleveland

Simms, the Steward

Raymond Brown

Spy Chief (uncredited)

Gordon De Main

Commander Bryson (uncredited)

Olaf Hytten

Grimson's Aide (uncredited)

George Nash

Waiter (uncredited)

Harry Schultz

Aide (uncredited)

Slim Whitaker

Crewman (uncredited)