- Bela Lugosi
- Dr. Melcher - aka Monsieur Colomb / Cell Prisoner
- Joan Barclay
- Alice Saunders
- George Pembroke
- Dr. Bill Saunders
- Clayton Moore
- Dick Martin
- Robert Frazer
- Amos Hanlin
- Edward Peil Sr.
- Ryder
- Robert Fiske
- Phillip Wallace
- Irving Mitchell
- John Van Dyke
- Kenneth Harlan
- FBI Chief Colton
- Max Hoffman Jr.
- Kearney
- Frank Melton
- FBI Agent
- Joseph Eggenton
- Stevens
- I. Stanford Jolley
- The Dragon
- Jack Cheatham
- Policeman
- Jack Chefe
- Hotel Clerk
- Bernard Gorcey
- The Cabbie
- Jack Holmes
- Industrialist
- Ethelreda Leopold
- Girl at Party
- Carl M. Leviness
- Industrialist
