When a scientist returns from Tibet, where he was transformed into a werewolf, he becomes the unwilling henchman of a fellow researcher who’s developing a substance that will allow her to control the minds of others.
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Cult 70s horror underground by Paul Naschy. However it is quite rare if not impossible to find any accomplished piece. This one is a quite poor, stereotypic and medicore one, maybe the worst from the serie. Werewolf fans who want to discover Paul Naschy universe should better try "la noche de walpurgis" (1971) and "Dr Jekyll y el hombre lobo" (1972).