Friday the 13th Part 5: A New Beginning (1985)

Jason was killed at the end of Part 4 by young Tommy Jarvis. Tommy is now aged eighteen and residing at Pinehurst Mental Institution, plagued with nightmares about Jason returning from the grave. Unfortunately, somebody wearing an Ice Hockey Mask has started killing off the inmates of the mental institution along with members of the local townsfolk. The killings appear to be the work of Jason Vorhee's, but Jason is dead isn't he? Well, yes actually he is. The killings are in fact being carried out by a copycat killer who's decided to take a leaf out of Jason's book. But he finally meets a sticky end when confronted by Tommy.