Cast
John Halliday
John Morgan
Jessie Busley
Mrs. Mudge
Don Beddoe
Ship's Chief Engineer Anderson
Alan Baxter
Larry Perrin, alias Larry Ross
Edgar Buchanan
Charles Atterbee
Stanley Logan
Captain James P. Hollister
Norbert Schiller
Submarine First Officer
Wyndham Standing
Man
Constance Bennett
Christine Blaine
Marjorie Gateson
Mrs. Winslow
Dick Rich
Perrin's Henchman at Dock
Frank Sully
Tommy Malone
Francis Pierlot
Professor Mudge
Bruce Bennett
Ship's gunnery officer
Erwin Kalser
Dr. Adolph Behrens
Olaf Hytten
Agent
Frank Baker
Detective
Pat O'Brien
Mike Farrough
Melville Cooper
Ship's Mate Penney
Douglas Gordon
Ship's Lookout