Casts
Bela Lugosi
as Dr. Feodor Orloff / Prof. John Dearborn
Hugh Williams
as Det. Insp. Larry Holt
Greta Gynt
as Diana Stuart
Edmon Ryan
as Lieutenant Patrick O'Reilly
O.B. Clarence
as Prof. John Dearborn (voice)
May Hallatt
as Police Constable Griggs
Bryan Herbert
as Police Sgt. Walsh
Julie Suedo
as Orloff's Secretary
