Treehouse of Horror X

In this year's exceptionally evil Halloween episode, Marge accidentally murders Ned Flanders and is haunted by his ghost in "I Know What You Diddily-Iddily Did", Bart and Lisa become superheroes who must rescue <i>Xena</i>'s Lucy Lawless from The Comic Book Guy in "Desperately Xeeking Xena", and Homer causes an computer-generated apocalypse in "Life's a Glitch, and Then You Die".