Doctor X

Lionel Atwill

Dr. Jerry Xavier

Fay Wray

Joanne Xavier

Lee Tracy

Lee Taylor

Preston Foster

Dr. Wells

John Wray

Dr. Haines

Harry Beresford

Dr. Duke

Arthur Edmund Carewe

Dr. Rowitz

Leila Bennett

Mamie

Robert Warwick

Commissioner Stevens

George Rosener

Otto, Dr. Xavier's Butler

Willard Robertson

Detective O'Halloran

Thomas E. Jackson

Daily World Editor

Harry Holman

Mike, Waterfront Policeman

Mae Busch

Cathouse Madame

Tom Dugan

Sheriff

Raoul Freeman

Morgue Detective (Uncredited)