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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.
Featured Crew
| Peter Mayhew | Editor |
| Robert Day | Director |
| Geoffrey Faithfull | Director of Photography |
| Jean Scott Rogers | Screenplay |
| Anthony Masters | Art Direction |
| Wally Schneiderman | Makeup Artist |
| Charles F. Vetter | Producer |
| John Croydon | Producer |
| Richard Gordon | Executive Producer |
| Peter Mayhew | Associate Producer |