Dr. Jekyll and Sister Hyde

Dr. Jekyll and Sister Hyde is a 1971 British film directed by Roy Ward Baker based on the novella Strange Case of Dr Jekyll and Mr Hyde by Robert Louis Stevenson. The film was made by British studio Hammer Film Productions and was their third adaptation of the story after The Ugly Duckling and The Two Faces of Dr. Jekyll.citation needed The film is notable for showing Jekyll transform into a female Hyde it also incorporates into the plot aspects of the historical Jack the Ripper and Burke and Hare cases. The two characters were played by the films stars, Ralph Bates and Martine Beswick.

Dr. Henry Jekyll dedicates his life to the curing of all known illnesses, however his lecherous friend, Professor Robertson, remarks that Jekylls experiments take so long to actually be discovered, he will no doubt be dead by the time he is able to achieve anything. Haunted by this remark, Jekyll abandons his studies and obsessively begins searching for an elixir of life, using female hormones taken from fresh cadavers supplied by murderers Burke and Hare, reasoning that these hormones will help him to extend his life since women traditionally live longer than men and have stronger systems. In the apartment above Jekylls lives a family an elderly mother, her daughter Susan Spencer, and Susans brother Howard. Susan is attracted to Jekyll, and he too returns her affections, but is too obsessed with his work to make advances. Once mixing the female hormones into a serum and drinking it, it not only has the effect of changing Jekylls character for the worse but also of changing his gender, transforming him into a beautiful but evil woman. Susan becomes jealous when she discovers this mysterious woman, but when she confronts Jekyll, to explain the sudden appearance of his female alter ego, he calls her Mrs. Hyde, saying she is his widowed sister who has come to live with him. Howard, on the other hand, develops a lust for Mrs. Hyde.Dr. Jekyll soon finds that his serum requires a regular supply of female hormones to maintain its effect, necessitating the killing of young girls. Burke and Hare supply his needs but their criminal activities are uncovered. Burke is lynched by a mob and Hare blinded. The doctor decides to take the matters into his own hands and commits the murders attributed to Jack the Ripper. Dr. Jekyll abhors this, but Mrs. Hyde relishes the killings as she begins to take control, even seducing and then killing Professor Robertson when he attempts to question her about the murders. ........

Source: Wikipedia