All Cast
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
