
In 19th century England, a noted brain surgeon rescues a former student from being hanged on a false conviction for murder, and spirits him away to an ancient, repurposed abbey far in the countryside. There, he connives his pupil into assisting him in mapping the functions of the various parts of the human brain, using living subjects who are under a terrible animation-suspending drug called "black sleep". Subsequently, the student, along with the daughter of one of the subjects, discover that most of these subjects have survived but are being kept in a dungeon-like cellar, in various stages of physical and mental derangement...
Cast

Basil Rathbone
Sir Joel Cadman

Herbert Rudley
Dr. Gordon Ramsay

Patricia Blair
Laurie Munroe

Akim Tamiroff
Odo the Gypsy

Phyllis Stanley
Daphne

Lon Chaney Jr.
Dr. Munroe, aka Mungo

Bela Lugosi
Casimir

John Carradine
Bohemund
George Sawaya
Sailor-Subject

Tor Johnson
Mr. Curry
Sally Yarnell
Female Subject
Peter Gordon
Sgt. Steele

Claire Carleton
Carmona Daly
Clive Morgan
Roundsman Blevins (uncredited)
Louanna Gardner
Angelina Cadman
Aubrey Schenck
Prison Coroner's Clerk (uncredited)
John Sheffield
Det. Redford (uncredited)
Crew

Reginald Le Borg
Director
John C. Higgins
Screenplay

Gerald Drayson Adams
Story
John F. Schreyer
Editor
Gordon Avil
Director of Photography
Aubrey Schenck
Executive Producer

Howard W. Koch
Producer
Cherie Banks
Hairstylist
George Bau
Makeup Designer
Ted Coodley
Makeup Artist
Jack Rabin
Visual Effects
Louis DeWitt
Visual Effects

Les Baxter
Original Music Composer
Clarence Steensen
Set Decoration
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