Synopsis: Christopher Lee plays psychologist Charles Marlowe who invents a drug which will release his patients' inhibitions - but when he tests it on himself he becomes cruel, immoral Edward Blake who descends into crime and eventually murder.
Peter Cushing plays Marlowe's lawyer, Utterson, who believes that Black is blackmailing his friend until he discovers the truth. Although this is an Amicus Films production, it looks like a 'Hammer horror' movie due to the presence in the cast of Mike Raven, Kenneth J. Warren and George Merritt and also the work of cinematographer Moray Grant
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