A robbery goes wrong and one of the gang, Jack (Paul Naschy), is shot in the head by the police but is taken to a doctor for some experimental brain surgery, this involves obtaining the fresh brain of a rival criminal known as The Sadist. Jack inherits his sadistic ways. French/Spanish crime thriller/horror, shot in France, it also packs in plenty of sex and nudity. Spanish barrel chested horror legend Naschy is billed under the name Paul Nash but that won't fool any fan of Euro-horror! I watched the English language version and the dubbing is hilariously bad, plus it has some very poor continuity and editing, for example a police car pulls up, the cops all jump out and open fire. Then seconds later the we see it repeated. What's more a man is shot multiple times yet not a single bullet hole can be seen! As for the sex we get this at 7, 34, 74 and 89 minutes. As is usual for the time the women get completely naked but the men (with one exception) keeps their clothes on, one man says "Don't be deceived by appearance and certainly not by women", pretty much sums up the sexism of the time. For fans of trashy Euro movies this is an enjoyable film that is in all honesty rather bad.