Sir Joel Cadman
Basil Rathbone
Dr. Gordon Ramsay
Herbert Rudley
Female Subject
Sally Yarnell
Sgt. Steele
Peter Gordon
Carmona Daly
Claire Carleton
Roundsman Blevins (uncredited)
Clive Morgan
Angelina Cadman
Louanna Gardner
Prison Coroner's Clerk (uncredited)
Aubrey Schenck
Det. Redford (uncredited)
John Sheffield
Laurie Munroe
Patricia Blair
Odo the Gypsy
Akim Tamiroff
Daphne
Phyllis Stanley
Dr. Munroe, aka Mungo
Lon Chaney Jr.
Casimir
Bela Lugosi
Bohemund
John Carradine
Sailor-Subject
George Sawaya
Mr. Curry
Tor Johnson
Director
Reginald Le Borg
Story
Gerald Drayson Adams
Original Music Composer
Les Baxter
Producer
Howard W. Koch
Screenplay
John C. Higgins
Visual Effects
Louis DeWitt
Editor
John F. Schreyer
Makeup Artist
Ted Coodley
Set Decoration
Clarence Steensen
Executive Producer
Makeup Designer
George Bau
Hairstylist
Cherie Banks
Jack Rabin
Director of Photography
Gordon Avil