Credits

Directed by
Colbert Clark
Albert Herman

Writing credits:
Colbert Clark story and screenplay
Wyndham Gittens story and screenplay
Norman S. Hall story and screenplay
George Morgan story and screenplay
Barney A. Sarecky story and screenplay

Cast (in credits order)

Bela Lugosi ...Prof. Anton Strang
Viva Tattersall ...Vera Strang
Malcolm MacGregor ...Jack Foster
George J. Lewis ...Bud Foster
Henry B. Walthall ...J.D. Bradley (company president)
Robert Warwick ...Det. Robert Raymond
Roy D'Arcy ...Prof. Alexis Steinbeck
Karl Dane ...Sparks (dispatcher)
Lloyd Whitlock ...Young (henchman #3)
Bob Kortman ...Jasper Slade (escaped convict)
Lafe McKee ...Mr. Jerome (company vice president)
rest of cast listed alphabetically:
William Desmond ...Empire Transport Co. driver
Lionel Backus ...Deane (henchman #4) (uncredited)
Yakima Canutt ...Detective [Ch. 12] (uncredited)
Ethel Clayton ...The Countess [Chs. 5-8] (uncredited)
Kernan Cripps ...Murphy (driver) [Chs. 1, 8] (uncredited)
Gordon De Main ...Detective [Chs. 1, 5-8] (uncredited)
Norman Feusier ...W.B. Jarvis [Chs. 3-6, 12] (uncredited)
Robert Frazer ...Official (uncredited)
Tom London ...Dupont (henchman #5) [Chs. 1-8] (uncredited)
George Magrill ...Mitchell (henchman #2) (uncredited)
George Morrell ...Empire warehouse worker (uncredited)
Eddie Parker ...Driver (uncredited)
Jack Perrin ...Williams (henchman #1) (uncredited)
Max Wagner ...Kruger (henchman #6) (uncredited)