The Strange Case of Dr. Jekyll and Miss Osbourne

Dr. Henry Jekyll (Udo Kier), where the doctor is being feted before his engagement to the austere Miss Fanny Osborne (Marina Pierro). The guests, who are various dignitaries and officials, then arrive. After a meal, the doctor is summoned to his laboratory to get his will. He returns to the living room when a scream is heard where one of his guests has been discovered to have been raped and murdered.

Henry Jekyll transforms to his alter ego, Mr. Hyde (Gérard Zalcberg), by taking a bath filled with a chemical cocktail. He emerges physically transformed. His alter ego has none of the restrictions of morality, and he proceeds to rape and torture various guests.

Eventually Fanny witnesses one such transformation. She leaps into the bath to be transformed as well. The two transformed leave the house and in a carriage they depart, undertaking blood letting of each other and engaging in love making.