Prom Night IV: Deliver Us from Evil (1992)
Prom Night IV: Deliver Us from Evil plot
"They ditched the prom for a private party, now it's their last dance."
A young couple is caught by priest Jonas making love. Jonas goes completely crazy and kills the two. The order to which Jonas belongs condemns him to life imprisonment in the cellars of the monastery. After thirty years of solitary confinement, Jonas manages to escape and goes after a group of teenagers who have just selected his monastery, now converted into a holiday home, to hold a party.
Pre- and sequels
Prom Night III: The Last Kiss
Hello Mary Lou: Prom Night II