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.
as Dr. Thomas Bolton
as Susan
as Resurrection Joe
as Supt. Charles Matheson
as Rachel
as Black Ben
as Jonathan Bolton
as Mr. Blount
as Hospital Chairman
as Insp. Donovan
as Rosa (as Yvonne Warren)
as Chief Inspector
as Hardcastle
as Hospital Official
as Arrested Woman (uncredited)
as Operations Assistant (uncredited)
as (uncredited)
