Low-budget cult horror, written and directed by Emilio Vieyra. The sinister Dr Humpp, in thrall to a hideous talking brain he keeps in his laboratory, has taken to kidnapping young people and keeping them prisoner in his isolated mansion. There, through a series of mind-altering experiments, Humpp forces the young people to have sex continuously so that he can drain a special serum from them, the only thing that prevents his transformation into a grotesque monster.