Years after the tragic drowning of her father at Crystal Lake, young telekinetic teenager Tina Shepard struggles with deep-seated guilt, believing her latent powers accidentally caused his death. Seeking treatment and hoping to help her daughter cope, Tina’s mother, Mrs. Shepard, brings her back to the familiar, picturesque shores of Camp Crystal Lake, now renamed Camp Forest Green. However, they are accompanied by the manipulative and unethical psychiatrist Dr. Crews, who secretly exploits Tina's fragile mental state for his own professional advancement rather than genuine healing.Meanwhile, a lively group of teenagers has rented a neighboring house to throw a
birthday party. Among them are Nick, a kind-hearted visitor who instantly connects with Tina, and a variety of stereotypical party-goers looking for romance and fun. Isolated and overwhelmed by Dr. Crews's
psychological abuse, Tina retreats to the dock. Desperate to undo her past mistakes and resurrect her deceased father using her mind, she inadvertently focuses her intense psychic energy on the murky depths below. Instead of her father, her powerful telekinesis inadvertently shatters the underwater chains holding Jason Voorhees, reviving the infamous, disfigured serial killer from his watery grave.Jason wastes no time returning to his relentless murderous rampage. One by one, the unsuspecting teenagers at the neighboring house fall victim to his brutal methods, utilizing everything from sleeping bags to party decorations. As the bodies pile up, the terrified youths realize they are trapped in a nightmare. Tina witnesses flashes of the carnage through psychic visions and tries desperately to warn the others, but Dr. Crews dismisses her harrowing premonitions as paranoid hallucinations, even locking her away to maintain control.Eventually, the bloodshed hits home when Jason attacks the Shepard residence, brutally murdering Mrs. Shepard and the abusive Dr. Crews. Left entirely alone to face the unstoppable behemoth, Tina resolves to use her formidable telekinetic gifts defensively. A thrilling, high-stakes psychic showdown ensues between Tina and Jason across the burning cabin. Throwing objects with her mind and unleashing raw energy, Tina inflicts severe damage on the monster, tearing away his hockey mask and exposing his rotting face.Just when Jason seems unstoppable, Tina’s psychic strain peaks, and she manages to summon the ghostly apparition of her father from the lake. Her father drags a startled Jason back down into the watery abyss. As the authorities finally arrive, Tina and Nick are rescued, believing the terror has finally ended beneath the peaceful waters of Crystal Lake.