William Nigh
Director
Jack Dietz
Production Manager
Sam Katzman
Producer
Johnny Lange
Music
Arthur Reed
Director of Photography
Carl Pierson
Editor
Jack Dietz
Producer
Lew Porter
Music
Dave Milton
Art Direction
Glen Glenn
Sound Engineer
Heinz Roemheld
Music
Arthur Hammond
Assistant Director
Gerald Schnitzer
Assistant Director
Harvey Gates
Original Story
Harvey Gates
Screenplay
Robert Kehoe
Story
Bela Lugosi
Dr. Melcher/ Monsieur Colomb
Clayton Moore
FBI Agent Richard ‘Dick’ Martin
Joan Barclay
Alice Saunders
George Pembroke
Dr. William Saunders
Robert Frazer
Amos Hanlin
Robert Fiske
Phillip Wallace
Irving Mitchell
John Van Dyke
Edward Peil Sr.
Ryder
Kenneth Harlan
FBI Chief Colton
Max Hoffman Jr.
Kearney
Joseph Eggenton
Stevens
I. Stanford Jolley
The Dragon
Frank Melton
FBI Agent
