After Chris' confrontation with Jason in the barn at Higgins Haven, Jason's
presumably dead body is taken to the Wessex County morgue. Jason escapes, kills an attendant
and a nurse and makes his way back to Crystal Lake.
Friends Paul, Jimmy, Ted, Doug, Samantha and Sara are on their way to a lakeside house they've
rented. On the way they pass a hitchhiker, who is soon killed by Jason. Next to the rental
house lives Mrs. Jarvis, her teenaged daughter Trish, and her twelve year-old son Tommy.
Trish and Tommy meet the renters, and run into them the next day skinny-dipping at Crystal
Point with local twins Tina and Terri. When the Jarvis' car breaks down, Trish and Tommy are
helped by Rob, a passing camper.
That night there is a drunken party at the rental house. When her boyfriend Paul starts dancing
with Tina, Samantha goes for a swim - and is killed. Paul has second thoughts and goes out
looking for her. Terri goes after Jimmy, and Jason kills Paul. While Tina is sleeping with
Jimmy, Terri leaves for home and is killed. When Mrs. Jarvis returns home after jogging, she
finds the house empty. The lights go out, and when she goes outside to look for the kids she
is killed. Trish and Tommy come home and Trish goes to look for her mother but only finds
Rob in his tent.
At the rental house, Tina goes to freshen up while Jimmy heads downstairs to gloat to Ted.
But when he goes into the kitchen to find the corkscrew... Jason hands it to him. Tina is
soon thrown out the window and Ted is stabbed while Rob tells Trish about his sister Sandra,
who Jason killed (in Part 2). Doug is killed in the shower, as is Sara when she tries
to escape after discovering the body. Returning to the Jarvis house, Trish and Rob try to
call the police, but the line is dead. They go next door where Rob goes into the basement -
and is killed by Jason. Trish escapes back to her house, where she and Tommy prepare to face
Jason. . .
