What if the transformation experienced by Dr. Jekyll resulted in a female form instead of a monstrous one? Around 1880, a series of murders targeting prostitutes began occurring in Whitechapel, east London. A professor (Gerald Sim) becomes suspicious of a colleague (Ralph Bates), who is developing an unusual elixir intended to prolong life—an elixir that requires female hormones sourced from recently deceased indi…

Hammer's reimagining of the Robert Louis Stevenson story with gender roles reversed proves to be wonderfully entertaining. Dr. Jekyll and Sister Hyde was directed by Roy Ward Baker, with a script from Brian Clemens. The cast includes Ralph Bates, Martine Beswick, Gerald Sim, Lewis Fiander, Susan Brodrick, and Dorothy Alison. David Whitaker composed the music, and Norman Warwick handled the cinematography. Dr. H…