The day after the events of Friday the 13th Part III, police and paramedics are busy cleaning up the mess deformed mass murderer Jason Voorhees left at Higgins Haven, including the defeated hockey-masked killer himself. Once delivered to the Wessex County morgue, it turns out that Jason is still alive. He rises, kills morgue doctor Axel by slicing and breaking his neck and nurse Morgan with a stomach stab, and heads back to Crystal Lake. A group of friends (Paul, Sam, Sara, Doug, Ted, and Jimmy) have rented a house on Crystal Lake. On the way there, the group passes Mrs. Voorhees' tombstone and a female hitchhiker, after the group drives off the hitchhiker becomes Jason's next victim, stabbed in the throat while eating a banana. Next to the rental house is the Jarvis home. The group meet Trish and Tommy when they arrive. The next day the group befriends twins Tina and Terri, who live in the area, and they all go skinny dipping at Crystal Point. Trish and Tommy, driving by, stop to see who's at Crystal Point and the group invites Trish to a party that night. Trish's car breaks down a bit further along the road, and they are helped by Rob, a hiker with mysterious reasons for visiting Crystal Lake, who soon becomes good friends with Trish and Tommy.