Dr. Jekyll & Sister Hyde 1971

Dr. Henry Jekyll is a physician who dedicates his life to curing all known illnesses. Yet a lecherous friend, Professor Robertson, bluntly remarks that Jekyll’s experiments take so long to bear fruit that he’ll likely be dead before they pay off. This merciless tease haunts Jekyll, pushing him to abandon his conventional research and become consumed by the pursuit of an elixir of life. He dives into a dangerous path, convinced that his own longevity could be unlocked by a radical, if morally murky, approach.

In his quest, Jekyll decides to craft a serum, drawing on female hormones gathered from cadavers supplied by the notorious criminals Burke and Hare — a pairing represented in the story by the linked names Burke and Hare. He reasons that these hormones might extend life because women traditionally live longer and are believed to possess stronger biological defenses. The plan is clinical on the surface, but it quickly becomes a dangerous obsession that blurs the line between science and danger.

Above Jekyll’s own residence, a simple family life hums in a modest apartment. An elderly mother, her daughter Susan Spencer, and Susan’s brother Howard live together, offering a quiet counterpoint to Jekyll’s fevered experiments. Susan is drawn to Jekyll, and he returns her affection, though his fixation on his work prevents him from pursuing a proper romance. The household’s calm is a fragile veneer that soon cracks as the true implications of Jekyll’s work begin to surface.

When Jekyll finally drinks the hormone-infused serum, his body undergoes a startling transformation: his male self becomes a vividly different female alter ego, Mrs. Hyde. This new persona emerges with a swift confidence and a taste for independence, and she is played on-screen by Martine Beswick. Susan, noticing the sudden appearance of a mysterious woman in Jekyll’s circle, grows curious and unsettled as the truth behind the strange stranger begins to unravel. To keep up the lie, Jekyll tells Susan that the new figure is his widowed sister who has come to live with him, a fabrication that only deepens the emotional tangle surrounding the household.

As Mrs. Hyde grows bolder, she asserts control, subtly manipulating events and taking pleasure in the darker impulses she embodies. The power struggle between Jekyll’s former, rational self and this extroverted female persona creates tension within the apartment and in Jekyll’s relationships. Howard, meanwhile, is drawn to the Hyde persona, while Susan’s affection for Jekyll becomes entangled with fear and confusion as the two personalities clash.

The serum’s dependence on a continuous supply of hormones forces Jekyll into a grim pattern: to sustain his life and the Hyde transformation, he finds himself compelled to murder again and again. The suppliers Burke and Hare are drawn into the escalating danger, and their criminal world eventually collapses when their activities are exposed. A mob overtakes Burke, leaving him lynched, while Hare is blinded by lime, a brutal turn of events that pushes Jekyll further into moral peril.

Despite his abhorrence of the murders, Jekyll’s other half — Mrs. Hyde — revels in the chaos she helps to unleash. She seduces and soon kills Professor Robertson when he presses for answers about the killings, further entangling Jekyll in a spiral he cannot easily escape. The struggle between the two personalities intensifies, a battle for dominance that leaves Jekyll increasingly unable to control the Hyde persona.

As the plot hurtles toward its climax, Jekyll plans to invite Susan to the opera, hoping for a rare moment of normalcy. In an unsettling twist, he dresses to go out but, in a moment of subconscious certainty, slips into Mrs. Hyde’s gown instead of his own clothes, realizing that he can no longer rely on the serum to transform—his willpower alone must face the consequences. Susan is heartbroken when Jekyll fails to join her, choosing instead to face the night alone as the danger around them intensifies.

With Mrs. Hyde rising in strength, the danger becomes personal, and Susan’s life becomes a focal point of the drama. She is stalked through the dark streets as Hyde’s dark ambitions threaten to engulf them all. Jekyll fights to preserve Susan’s safety, but his dual nature remains a looming catastrophe he cannot fully outrun. He attempts one last murderous act to stabilize his condition, yet the police close in after Hare’s comments reveal a frightening connection between Jekyll’s cadaver experiments and the notorious murders of Jack the Ripper.

In a final, fatal confrontation, Jekyll attempts to escape by clinging to the exterior of a building. But he cannot separate himself from the Hyde force within, transforming at the last moment and plummeting to the ground as an amalgamation of both male and female forms — dying as a grim symbol of the unresolved tension that has driven the entire tale. The story ends with a haunting synthesis of science, desire, and consequences, leaving the audience to ponder the cost of playing god with life and gender.