Two months after the events of the original Friday the 13th, Alice (Adrienne King), the lone survivor or Mrs. Vorhees' killing spree, meets a grisly end in her city apartment. Five years later, a new group of co-eds converges near Camp Crystal Lake, scene of the original massacre and the drowning of Jason Vorhees that preceded it. This time around, the horny collegians attend a nearby training school for camp counselors. As half the group parties in town, an unseen assailant picks off the other half one by one. Only when camp leader Paul (John Furey) and his girlfriend, Ginny (Amy Steel), return to camp do they uncover the identity of their stalker -- none other than Jason (Warrington Gillette) himself, alive but grotesquely deformed as a result of his childhood drowning. Flashbacks chronicle Jason's behind-the-scenes activities in the first film (perhaps explaining how his mother was able to throw the dead bodies of muscular youths through windows with such apparent ease). The young couple's only hope to defeat the fiend lies in psych major Ginny's insights in Jason's mental state.