I, Monster
I, Monster is a 1971 British horror film directed by Stephen Weeks (his feature debut) for Amicus Productions.
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Psychologist Charles Marlowe (Lee) invents a drug which will release his patients' inhibitions. When he tests it on himself, he becomes the evil Edward Blake, who descends into crime and eventually murder. Utterson (Cushing), Marlowe's lawyer, believes that Blake is blackmailing his friend until he discovers the truth.