Bela Lugosi
Dr. Melcher/ Monsieur Colomb
Acting
Clayton Moore
FBI Agent Richard ‘Dick’ Martin
Acting
Joan Barclay
Alice Saunders
Acting
George Pembroke
Dr. William Saunders
Acting
Robert Frazer
Amos Hanlin
Acting
Robert Fiske
Phillip Wallace
Acting
Irving Mitchell
John Van Dyke
Acting
Edward Peil Sr.
Ryder
Acting
Kenneth Harlan
FBI Chief Colton
Acting
Max Hoffman Jr.
Kearney
Acting
Joseph Eggenton
Stevens
Acting
I. Stanford Jolley
The Dragon
Acting
Frank Melton
FBI Agent
Acting