Lionel Atwill

as Dr. Jerry Xavier

Fay Wray

as Joanne Xavier

Lee Tracy

as Lee Taylor

Preston Foster

as Dr. Wells

John Wray

as Dr. Haines

Harry Beresford

as Dr. Duke

Arthur Edmund Carewe

as Dr. Rowitz

Leila Bennett

as Mamie

Robert Warwick

as Commissioner Stevens

Michael Curtiz

Director