Walter Pidgeon
— Nick Carter
Donald Meek
— Bartholomew
Joseph Schildkraut
— Mr. Al Taurez
Florence Rice
— Cora Barnes
Nat Pendleton
— 'Gunboat' Jacklin
Cecil Kellaway
— Franklin Morris
John Carroll
— John Ramsell Jr.
Steffi Duna
— Dolores
Dwight Frye
— Eddie Anders
Matthew Boulton
— John Ramsell Sr.
Harry Tyler
— Cafe Waiter
Joe Yule
— Sailor
Alec Craig
— Andy MacMillan
Thomas W. Ross
— Dr. Grisson
Hugh Beaumont
— Seaman
Guy Bellis
— Pierson - Sir Edward's Aide
Dick Botiller
— Taurez's Henchman
John Burton
— Steve Donnigan of Scotland Yard (uncredited)
Charles Coleman
— U.S. Agent Hilton
Franco Corsaro
— Ysidro - Morris' Head Clerk (uncredited)
George Douglas
— Taurez's Henchman
Ralph Dunn
— Port Policeman
Lee Tung Foo
— Mr. Yamamoto
John George
— Man in Cafe (uncredited)
Edward Hearn
— Officer on the Orchid
Holmes Herbert
— Sir Edward
Claire James
— Pretty Girl at End
Kenner G. Kemp
— Man in Cafe
William Lally
— Port Inspector
Stanley Mann
— First Mate