cast
- Bela Lugosi
- Dr. Melcher Colomb
- Joan Barclay
- Alice Saunders
- Clayton Moore
- Dick Martin
- George Pembroke
- Dr. William Saunders
- Robert W. Frazer
- Amos Hanlin
- I. Stanford Jolley
- The Dragon
- Max Hoffman, Jr.
- Kerney
- Irving Mitchell
- John Van Dyke
- Kenneth Harlan
- Colton
- Joseph Eggenton
- Stevens, the butler
- Bernard Gorcey
- The Cabby
- Edward Peil Sr.
- Wallace
- Frank Melton
- Spy
- Robert Fiske
- Ryder
crew
- William Nigh
- Director
- Jack Dietz
- Producer
- Sam Katzman
- Producer
- Harvey Harris Gates
- Screenwriter
- Art Reed
- Cinematographer
- Lange and Porter
- Composer (Music Score)
- Carl Pierson
- Editor
- Dave Milton
- Art Director
- Barney A. Sarecky
- Associate Producer
- Glen Glenn
- Sound/Sound Designer
- Arthur Hammond
- First Assistant Director
- Gerald J. Schnitzer
- First Assistant Director
- Edward W. Rote
- Production Manager
