Bela Lugosi

Dr. Feodor Orloff / Prof. John Dearborn

Hugh Williams

Det. Insp. Larry Holt

Greta Gynt

Diana Stuart

Edmon Ryan

Lieutenant Patrick O'Reilly

O.B. Clarence

Prof. John Dearborn (voice)

May Hallatt

Police Constable Griggs

Bryan Herbert

Police Sgt. Walsh

Julie Suedo

Orloff's Secretary