The graduating class of the local high school is going on a luxury cruise with Jason Voorhees as a stowaway. The heroine Rennie Wickham believes she was almost drowned by Jason as a child. Jason eventually sinks the boat and kills many of the students on it, but many of them escape to Manhattan. A long battle with Jason ensues until Jason is washed away in the New York sewers by a midnight flooding of toxic waste.

The secret of Jason's evil is revealed. It is up to the last remaining descendant of the Voorhees family to stop Jason before he becomes immortal and unstoppable. This is the final (?) battle to end Jason's reign of terror forever.