Diretor/a
Colbert Clark
DIRETOR/A
Albert Herman
Elenco (na ordem dos créditos)
Bela Lugosi
Prof. Adam Anton Strang
Viva Tattersall
Vera Strang
Malcolm McGregor
Jack Foster
Henry B. Walthall
J.D. Bradley - Company President
Robert Warwick
Detective Robert Raymond
Ethel Clayton
The Countess Helen [Chs. 5-8]
Roy D'Arcy
Prof. Alexis Steinbeck
Karl Dane
Sparks - Dispatcher
Lloyd Whitlock
Young - Henchman #3
Bob Kortman
Jasper Slade - The Convict
Lafe McKee
D.W. Jerome - Company Vice President
Lionel Backus
W.B. Jarvis [Chs. 3-6, 12](uncredited)
Yakima Canutt
Detective [Ch. 12](uncredited)
Kernan Cripps
Murphy - Driver [Chs. 1, 8](uncredited)
Gordon De Main
Detective [Chs. 1, 5-8](uncredited)
William Desmond
Empire Transport Co. driver(uncredited)(unconfirmed)
Norman Feusier
Deane [Ch. 10](uncredited)
Robert Frazer
Official(uncredited)(unconfirmed)
George J. Lewis
Bud Foster [Ch.1, 8](uncredited)
Tom London
Dupont - Henchman #5 [Chs. 1-8,12](uncredited)
George Magrill
Mitchell - Henchman #2 [Ch. 2](uncredited)
George Morrell
Empire Warehouse Worker(uncredited)
Eddie Parker
Gus - Driver Bud's Partner - [Ch. 1, 3](uncredited)
Jack Perrin
Williams - Henchman #1 [Ch. 3](uncredited)
Max Wagner
Kruger - Henchman #6 [Ch. 1](uncredited)