John Wayne as Duke Slade

Diana Gibson as Janet Drew

Montagu Love as Capt. Abner Drew

Moroni Olsen as First Mate Rand Husk

Maurice Black as Blackie

Paul White as Kalo

George Cleveland as Tom

P.J. Kelly as Matt

Cameron Hall as Slivers

James T. Mack as Hooten

Britt Wood as Hardy

William Sundholm as Chips

Ben Carter as Stantul, Black Sailor

Wally Howe as Kierce

Jimmie Lucas as Flench, Black Cabin Boy

Glenn Strange as Barzeck

Lynton Brent as Sailor (uncredited)

Victor Potel as Tall Sailor (uncredited)