As a young girl, Tina Shepard was thrust into the harsh realities of her chaotic home life, witnessing the brutal behavior of her father towards her mother. In her desperate quest for peace, she fled to Crystal Lake by boat, inadvertently awakening her latent telekinetic powers when her father attempted to stop her. The devastating repercussions of this traumatic incident would haunt her for years to come.
Now a teenager, Tina is still wrestling with the trauma of her father's tragic death and the emotional scars it left behind. Her mother, Amanda, seeks support from Dr. Crews (Terry Kiser), Tina's psychiatrist, who exploits her vulnerabilities through manipulative verbal attacks aimed at heightening her emotional turmoil and extracting her telekinetic abilities. Little does Tina know, this cruel treatment is merely a pretext for Dr. Crews to harness her powers for his own nefarious ends.
As Tina continues to be consumed by the memories of her father's demise, she finds herself irresistibly drawn back to the lakeside setting where her life shattered. Overcome with grief, she inadvertently resurrects the infamous Jason Voorhees (Kane Hodder), the dreaded mass murderer who had been confined to the depths of Crystal Lake since the end of Part 6. The revived killer emerges, ready to unleash a reign of terror on unsuspecting campers.
Meanwhile, just next door, a lively group of teenagers celebrates Michael's birthday with an exuberant party. This eclectic mix includes Michael's cousin Nick (Kevin Spirtas), along with preppy Russell, his girlfriend Sandra, Ben with his girlfriend Kate, Eddie, the science fiction writer, stoner David, lively Robin, shy Maddy, and the snobbish socialite Melissa. Amidst the party atmosphere, Nick becomes enamored with Tina, causing jealousy to flare in Melissa, who attempts to ruin their budding connection by kissing Eddie.
In confidence, Tina shares with Nick the horrifying truth about Jason's return and a chilling vision where she foresees Michael's tragic end at the hands of the monstrous killer. Disaster strikes as Jason begins to eliminate those around him, claiming the lives of Michael and his girlfriend Jane, alongside a couple camping in the woods. With the body count escalating, Tina's telekinetic powers intensify, setting the stage for a catastrophic confrontation between her and Jason.
Tina and Nick embark on a mission to find Tina's mother, but as they do, a gruesome onslaught unfolds, leaving devastation in their wake. Shrouded in chaos, Jason methodically decimates the group of teenagers. As Russell and Sandra take a swim in the lake, their innocent moment is shattered when Sandra discovers Russell’s mutilated body. Her screams go unheard as she too falls victim to Jason’s wrath.
In a desperate search for help, Maddy comes across Russell’s corpse but is swiftly pursued by Jason, meeting her end with a deadly sickle strike. The carnage continues as Ben suffers a brutal fate with a crushed skull, and Kate meets a grisly end with a party horn lodged in her eye.
Inside the house, chaos reigns as Jason wreaks havoc: David is stabbed, and Eddie suffers a vicious slash to his neck. Robin, exploring upstairs, encounters David's severed head, only to be brutally thrown out a window to her death.
As chaos peaks, Dr. Crews faces Jason and, in a desperate act of self-preservation, uses Amanda as a shield. However, his respite is short-lived as Jason swiftly dispatches him with a brutal chainsaw attack. Distraught from discovering her mother's lifeless body, Tina channels her powers, electrocuting Jason and toppling a portion of the house onto him.
In a frantic attempt to reveal the horror of their experiences to Melissa, she dismisses them as insane and tries to escape. But Jason has other plans, striking her down with an axe blow that leaves her face in ruins.
Despite Nick’s valiant effort to confront Jason, he is quickly overwhelmed. Tina, drawing on her abilities, rips Jason’s mask off, exposing his grotesque face. As their battle wages, the Shepard cabin succumbs to an inferno, spilling destruction onto the dock.
While Tina can't definitively defeat Jason, she inadvertently calls upon the spirit of her father from the lake's depths, dragging Jason back into the abyss. As Jason’s struggles fade, the scene shifts to Tina and Nick being whisked away in an ambulance, leaving behind a sense of unsettling dread over the wreckage.
As dawn breaks on the horizon, it becomes clear that Tina has inadvertently sealed Jason's fate once more, his sinister presence lingering even as the screen fades to black, accompanied by whispers that hint at his ongoing existence.
