Nightmare on Evergreen Terrace (Season 7, “Treehouse of Horror VI”)
Groundskeeper Willie being twisted into Freddy Kruger is such a perfect use of the character that it seems wild it took the show seven seasons to finally do it. This episode is also surprisingly brutal, with kids like Martin getting violently murdered onscreen as Willie enters dreams and hunts down the kids whose parents let him burn during a PTA meeting. But in the parents’ defense: They all wanted to get out of there fast because it was a terrible, nasty Smarch evening
