Wallace Beery
— John Thorson
Chester Morris
— 'Rocky' Blake
Virginia Grey
— Susan Thorson
Douglass Dumbrille
— District Commander
Carl Esmond
— U-Boat Captain
Clem Bevans
— 'Cap' Finch
John Qualen
— Milo
Regis Toomey
— Ives
Henry Victor
— German U-Boat Officer
Addison Richards
— Admiral Ross
Hans Joby
— U-Boat Petty Officer
Henry Hunter
— Ensign Dyer
Jonathan Hale
— Admiral Girard
Leon Ames
— Recruiting Officer (uncredited)
Arthur Belasco
— Fisherman (uncredited)
Joseph E. Bernard
— Fisherman (uncredited)
Wade Boteler
— Recruiting Officer (uncredited)
Al Bridge
— Fisherman (uncredited)
Rand Brooks
— Listener (uncredited)
Don Castle
— Radio Operator (uncredited)
Jack Chapin
— Sailor (uncredited)
Tom Chatterton
— Lieutenant (uncredited)
Jack Rube Clifford
— Captain (uncredited)
Jules Cowles
— Man with Finch (uncredited)
Leigh De Lacey
— Mrs. Gill (uncredited)
Joe De Stefani
— Fisherman (uncredited)
Edgar Dearing
— Petty Officer (uncredited)
Richard Elmore
— Lookout (uncredited)
Frank Faylen
— Recruiting Officer (uncredited)
Budd Fine
— Survivor (uncredited)