
In 1840s London, Dr. Thomas Bolton [Boris Karloff] dares to dream the unthinkable: experimenting with anesthesia gases to make surgery pain-free. While doing so, his demonstration before a panel of his peers ends in a horrific mishap with his patient awakening under the knife; he is forced to leave his position in disgrace. To complicate matters, he becomes addicted to his own chemical experiments and gets involved with a criminal gang led by Black Ben [Francis de Wolff], and a ruthless killer Resurrection Joe [Christopher Lee]. Unfortunately, this shady partnership leads Dr. Bolton to further ruin, culminating in his unwitting participation in murder — for which he becomes the first victim of a blackmail scheme.
Cast

Boris Karloff
Dr. Thomas Bolton

Betta St. John
Susan

Christopher Lee
Resurrection Joe

Finlay Currie
Supt. Charles Matheson

Adrienne Corri
Rachel

Francis de Wolff
Black Ben

Francis Matthews
Jonathan Bolton

Frank Pettingell
Mr. Blount

Basil Dignam
Hospital Chairman

Nigel Green
Insp. Donovan

Yvonne Romain
Rosa (as Yvonne Warren)

Howard Lang
Chief Inspector

Charles Lloyd Pack
Hardcastle

Bernard Archard
Hospital Official

Marianne Stone
Arrested Woman (uncredited)

Desmond Llewelyn
Operations Assistant (uncredited)

Skip Martin
(uncredited)
Crew

Robert Day
Director
Jean Scott Rogers
Screenplay
Peter Mayhew
Editor, Associate Producer
Geoffrey Faithfull
Director of Photography
Michael Stevenson
Third Assistant Director
Peter Bolton
Assistant Director
Richard Gordon
Executive Producer
John Croydon
Producer
Charles F. Vetter
Producer
Eileen Warwick
Hairstylist
Wally Schneiderman
Makeup Artist
Maurice Askew
Sound Recordist
Cyril Swern
Sound Recordist
Buxton Orr
Original Music Composer
Susan Dyson
Continuity
George Mills
Production Manager

Anthony Masters
Art Direction
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