Dr. Thomas Bolton
Boris Karloff
Dr. Thomas Bolton

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.
Dr. Thomas Bolton
Boris Karloff
Dr. Thomas Bolton
Susan
Betta St. John
Susan
Resurrection Joe
Christopher Lee
Resurrection Joe
Supt. Charles Matheson
Finlay Currie
Supt. Charles Matheson
Rachel
Adrienne Corri
Rachel
Black Ben
Francis de Wolff
Black Ben
Jonathan Bolton
Francis Matthews
Jonathan Bolton
Mr. Blount
Frank Pettingell
Mr. Blount
Hospital Chairman
Basil Dignam
Hospital Chairman
Insp. Donovan
Nigel Green
Insp. Donovan
Rosa (as Yvonne Warren)
Yvonne Romain
Rosa (as Yvonne Warren)
Chief Inspector
Howard Lang
Chief Inspector
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