Burns the Vampire
The Springfield news reports that Mr. Burns has bought the Springfield blood bank. Soon after, the Simpsons receive a personal invitation to a midnight dinner at Burns' country house in Pennsylvania. Lisa instantly suspects that he is a vampire, but the rest of the family dismisses her concerns. At Mr. Burns' mansion, Bart and Lisa discover a secret staircase descending to a basement filled with coffins; as they investigate, the coffins open and vampires emerge to threaten them. They are clearly vampires - secret vampire room, vampire fangs, it all adds up. Bart and Lisa flee back up the staircase, but Bart is unable to resist a lever to convert the staircase into a "super fun happy slide". Although Lisa escapes, Bart slides back down into the vampires' clutches, where Mr. Burns appears and bites him. Despite obvious bite marks on Bart's neck and his dazed demeanor, Mr. Burns assures the Simpsons that their son is fine. Bart attacks Lisa that night, but she escapes and is finally able to convince her parents of Bart's vampiric nature. The only way to restore him, Lisa says, is to kill the head vampire. The family returns to Mr. Burns' mansion and drives a stake through his heart (after missing and stabbing him in the crotch once).
