Trailer
Cast
- Bela Lugosi as Dr. Alex Zorka
- Robert Kent as Capt. Bob West
- Dorothy Arnold as Jean Drew
- Edwin Stanley as Dr. Fred Mallory
- Regis Toomey as Jim Daly
- Jack C. Smith as Monk
- Edward Van Sloan as Jarvis [Chs. 2-12]
- Dora Clement as Ann Zorka [Chs. 1-2]
- Anthony Averill as Rankin - Henchman [Chs. 2-12]
- Hugh Huntley as Perkins - Mallory's Lab Assistant [Chs. 2-12]
Crew
- Ford Beebe · Director
- Saul A. Goodkind · Director
- George H. Plympton · Writer
- Basil Dickey · Writer
- Mildred Barish · Writer
- Wyllis Cooper · Writer
- Jerome Ash · Cinematographer
- William A. Sickner · Cinematographer
- Irving Birnbaum · Editor
- Joseph Gluck · Editor
- Alvin Todd · Editor