William Nigh
Director
Sam Katzman
Producer
Johnny Lange
Music
Arthur Reed
Director of Photography
Jack Dietz
Production Manager
Carl Pierson
Editor
Glen Glenn
Sound Engineer
Dave Milton
Art Direction
Lew Porter
Music
Heinz Roemheld
Music
Jack Dietz
Producer
Gerald Schnitzer
Assistant Director
Arthur Hammond
Assistant Director
Harvey Gates
Original Story
Robert Kehoe
Story
Harvey Gates
Screenplay
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
