Pat O’Brien

Mike Farrough

Constance Bennett

Christine Blaine

John Halliday

John Morgan

Alan Baxter

Larry Perrin, alias Larry Ross

Erwin Kalser

Dr. Adolph Behrens

Edgar Buchanan

Charles Atterbee

Frank Sully

Tommy Malone

Marjorie Gateson

Mrs. Winslow

Francis Pierlot

Professor Mudge

Jessie Busley

Mrs. Mudge

Melville Cooper

Ship's Mate Penney

Stanley Logan

Captain James P. Hollister

Leslie Denison

Ship's Mate Jones

Don Beddoe

Ship's Chief Engineer Anderson

Norbert Schiller

Submarine First Officer

John Brahm