Cast 13

Bela Lugosi

Dr. Feodor Orloff / Prof. John Dearborn

Hugh Williams

Det. Insp. Larry Holt

Greta Gynt

Diana Stuart

Edmon Ryan

Lieutenant Patrick O'Reilly

Wilfred Walter

Blind Jake

Arthur E. Owen

Dumb Lou

Alexander Field

Fred Grogan

Gerald Pring

Henry Stuart

O.B. Clarence

Prof. John Dearborn (voice)

May Hallatt

Police Constable Griggs

Bryan Herbert

Police Sgt. Walsh

Charles Penrose

Morrison, undercover detective

Julie Suedo

Orloff's Secretary

Crew 16

Walter Summers

Writing

John Argyle

Production

Patrick Kirwan

Writing

John Argyle

Writing

Walter Summers

Directing

Edgar Wallace

Writing

Guy Jones

Sound

Bryan Langley

Camera

Jan Van Lusil

Crew

Hamilton G. Inglis

Production

Harry Benson

Sound

A.E. Rudolph

Sound

Ted Richards

Editing

Duncan Sutherland

Art

Jack Martin

Directing

Ronald Anscombe

Camera