Four years after the events of Part II two popular teenagers, Juli and Holden, are shown sneaking into Camp Crystal Lake at night, which is soon to be re-opened again following its failure to re-open just over five years previously due to a brutal massacre that left a dozen people dead.
Holden scares Juli by telling her the legend of Jason Voorhees, the boy who drowned in the lake. Juli tells him to knock it off but he continues by telling her about how Pamela murdered the two negligent counselors and set a load of fires. Then, twenty years later another massacre occurred days before the camp was supposed to re-open, Holden explains. After another massacre the following year police were left shocked and confused as, yet again, they never found Jason's body while up to nine recovery workers seemingly vanished. Eventually, they stopped looking. Since then more and more people have disappeared over the years with police doing their best to ignore the pleas of families of the victims, essentially pretending the cases are all unrelated.
Juli calls his story bullshit, telling him that Jason's mother was the killer and had the help of an escaped lunatic, not Jason. Holden argues that that was just the official story. Juli calls him a liar and that if he really wanted to have sex with her he wasn't doing a good job of seducing her. As she walks ahead she hears a noise and turns around to find Holden gone. She calls out his name but he doesn't answer. She tells him it isn't funny but still gets no answer. She begins to walk through the camp, feeling like someone is watching her. She hears noises from the trees and begins running through the camp, hiding inside a ram-shackled cabin. She hides under an old bed and holds her breath as someone suddenly enters the cabin. The figure walks back and forth before stopping, and then leaving. She crawls out from under the bed and flees the cabin, running until she trips over a branch. As she gets to her knees she hears someone running behind her and turns around to see Holden, who scares her. She slaps him, angrily insulting him as he tries to tell her it was just a prank. She gets annoyed and he begins kissing her, telling her he's sorry and that he loves her. Still annoyed, she tells him she still hasn't forgiven him as they continue making out. Holden asks her if she wants to have sex in one of the cabins and she tells him she wants to have sex on the jetty. Holden calls her kinky and they head for the jetty.
They begin to have sex on the jetty, Juli on top, as she still insults him about the prank. He tries to get her to forget about it but she persists. She asks why he didn't just scare her when he entered the cabin as it would have been easier and he tells her he wasn't in any of the cabins, he was looking for her outside. Juli tells him that isn't possible, as someone entered and left the cabin while she was hiding under the bed. Holden passes this off as her imagination but she stops and tells him someone was inside the cabin. When everything is silent she tells him she heard something. He tells her she can't prank him, that it won't work. The noise persists and she looks down through a gap in the jetty just as a machete is shoved up through the jetty, and up through Holden's back/stomach, almost stabbing her in the face. She falls off Holden and onto the jetty, screaming as his blood sprays over her. The machete is pulled down through the jetty and she attempts to pull Holden up but he's been paralyzed. Just then the machete is shoved up through Holden's head/out his mouth. Juli screams and flees, the machete being shoved up through the back of her foot as she attempts to run. She narrowly avoids being stabbed several more times before making it back to land. Jason, shown from behind, bursts from the jetty as Juli looks on in horror. She runs into one of the cabins and grabs a screwdriver, hiding under the same bed as before and watches the door, waiting to attack Jason if he enters. A figure enters and she stabs the person in the foot before he lets out a yelp and its revealed he's a security guard who has been alerted because they tripped an alarm. She apologizes and breaks down into tears as another guard appears and asks what the hell is going on.
At the hospital Juli is shown sitting in a hospital bed, being checked over, as she tearfully looks out a window while talking about the hockey masked killer. In the hallway a Sheriff Arnold Porter is shown looking at the girl, bowing his head in anger. The Doctor appears and tells him she'll be fine physically, but will probably need a lot of psychological help. Arnold simply asks if "Is it him?" and the Doctor nods, walking away as he dryly comments that she's one of the lucky ones. Arnold tells him that it won't be happening again and the Doctor asks him if he has really started believing that line he tells himself. Arnold looks at Juli again, who has broken into tears and laughter, and is forced to look away.
- Matilda Lutz as Chrissy Archer
- Ansel Elgort as Nathan Hartley
- Michael Madsen as August Galloway
- Robin Wright as Miranda Sullivan
- David Koechner as Sheriff Arnold Porter
- Emily Ratajkowski as Tamara Mitchell
- Kiersey Clemons as Grace Fisher
- Kelly Rohrbach as Shelby Casey
- Tyler Hoechlin as Brandon Forrester
- Max Thieriot as Austin Winters
- Lucien Laviscount as Finn Jackson
- Will Poulter as Pvt. Henry Jarvis
- Adewale Akinnuoye-Agbaje as Sgt. Owen Maddox
- Shannon Kane as Pvt. Lyla Delgado
- Quincy Dunn-Baker as Cpl. Ross Carter
- Jesse Bradford as Cpl. Diego Rodriguez
- Virginia Gardner as Juli
- Logan Paul as Holden
- Derek Mears as Jason Voorhees
Main Cast Gallery