Dr. Jekyll and Mr. Hyde

After his great-uncle dies, Richard Jacks joins the will reading and discovers he is the great-grandson of Dr. Henry Jekyll, receiving only old notes from scientific experiments. This revelation motivates him to experiment with a serum based on his ancestor's work. He becomes curious about creating a new formula that could change his life.

Richard adds more estrogen to his ancestor's original formula, hoping to perfect it. He ingests the serum but waits all night without any noticeable effects, feeling unsure about his experiment's success. Later, he prepares to attend a job interview, unaware of the serum's immediate impact.

During a job interview at a restaurant, a coffee spill and Richard’s excitement trigger the serum’s effects. He starts transforming, with his body developing long nails, disappearing arm hair, a changing voice, and internal genital transformation, leading to a shockingly visible set of breasts as he looks in a mirror.

Richard, now fully transformed into a woman named Helen Hyde, runs out of the restaurant in shock. He attempts to hide his new appearance and finds himself in the laboratory shower, where he is seductively caressed by Pete, who is unaware of Helen’s true identity.

Helen, adopting her new identity, convinces Richard's colleagues that she is his assistant. She begins to flirt with his superiors, Yves Dubois and Oliver Mintz, and indulges in a shopping spree on Richard’s credit cards, further establishing her new persona and influence.

Helen meets Richard’s fiancée, Sarah, and cleverly befriends her, convincing her to move out. Meanwhile, Richard struggles with his memory of transforming and tries to reconnect with Sarah, but he begins to turn back into Helen, causing her to flee in confusion and distress.

Helen, now in a professional setting, seeks a promotion and steals Richard’s perfume formula to create her own scent, Indulge. She uses her allure to manipulate Mintz and Dubois during a presentation, gaining their infatuation and persuading them to advance her perfume project.

Helen creates videotapes revealing her plan to fully possess Richard’s body. Richard attempts to thwart her by stripping and writing obscene messages on his body, but his efforts backfire, and he gets fired from his job. Helen intercepts a call from Pete, sabotaging his attempt to expose her.

Richard, now desperate, develops a new serum to reverse his transformation. Sarah agrees to administer the antidote but can only give part of it before Helen escapes to attend the perfume launch party, risking losing her fully transformed self forever.

At the perfume launch, Helen celebrates her success, but Sarah intervenes by injecting her with the remaining formula. This final dose causes Helen to undergo a last transformation, returning Richard to his original form in front of the audience.

Richard, now back to himself, gives a speech about his transformation, explaining that he became Helen to understand women better. His boss offers him a promotion and vacation, signaling acceptance and support for his experience. Richard leaves with Sarah, embracing his true self.