JASON GOES TO HELL: THE FINAL FRIDAY

At Crystal Lake, Jason Voorhees stalks a woman. The woman (in fact an undercover FBI agent) lures Jason into a trap where FBI SWAT agents attack and kill him with a grenade launcher. Jason's remains are sent to a morgue, where his beating heart is eaten by the coroner, allowing Jason's soul to possess him. Jason, in the coroner's body, escapes the morgue, killing another coroner and two FBI guards.

Jason finds three teenagers at Crystal Lake and kills them. When two police officers are called to investigate, Jason kills one of them and possesses the other. Bounty hunter Creighton Duke discovers that only members of Jason's bloodline can permanently kill him, and he will return if he possesses a family member. The only living relatives of Jason are his half-sister Diana Kimble, her daughter Jessica, and Stephanie, the young daughter of Jessica and Steven Freeman.

Jason attempts to possess Diana but Steven stops him. Diana is killed, and Jason escapes. Steven is arrested for the murder of Diana. He meets Duke in prison, who gives Steven information about Jason and his connection with Jessica and breaks a couple of Steven's fingers. Determined to get to Jessica before Jason, Steven escapes from prison. He goes to the Voorhees house to find evidence to convince Jessica of her link to Jason. Jessica's boyfriend, TV reporter Robert Campbell, receives a phone call in the house that Steven overhears, which reveals that Campbell is attempting to boost ratings by revealing Jason's return from death. Jason transfers his heart to him through their mouths. Now in Campbell's body, Jason leaves and attempts to possess Jessica. Steven stops him and tries to explain everything to Jessica, but she does not believe him and goes to the police station without him.

Jason arrives and kills the officers while searching for Jessica, who he nearly possesses before Steven stops him again. Duke escapes from his cell in the resulting chaos. Now believing Steven, Jessica goes with him to the diner to get Stephanie. Jason arrives and is attacked by the owners and a waitress. Jessica and Steven discover that Duke has Stephanie, and he demands that Jessica meet him at the Voorhees house alone.

Jessica abandons Steven, meets Duke, and is given a magic dagger which she can use to permanently kill Jason. An officer enters the diner and is possessed by Jason. Duke falls through the floor of the Voorhees house as Sheriff Landis and Officer Randy arrive to confront Jessica. Landis is accidentally killed with the dagger that Jessica drops. Jason, possessing Randy, attempts to be reborn through Stephanie, but Steven arrives and kills him with a machete. Jason's heart has become a demon which enters Diana, allowing Jason to be reborn in his original body as Steven and Jessica rescue Duke.

While Steven and Jessica attempt to find the dagger, Duke distracts Jason and is killed. Jason and Steven fight while Jessica retrieves the dagger and stabs Jason. As the souls Jason killed are released, demons drag Jason into hell. While Jessica and Steven walk off with Stephanie into the sunrise, a glove with bladed fingers bursts from the ground, grabs Jason's mask, and drags it underground.

Jason attempts to possess his last remaining blood relatives to become immortal, but is ultimately fought by Jessica Kimble, who uses a mystical dagger to permanently kill him.

The ending cements Jessica’s role as the only person capable of ending Jason’s carnage due to her bloodline. By introducing a mystical dagger and family legacy, the film departs from standard slasher fare, adding supernatural stakes and a sense of finality—though the question mark in the 'final' title leaves room for interpretation.