"Treehouse of Horror X" is the fourth episode of the eleventh season of the American animated television series The Simpsons, and the tenth annual Treehouse of Horror episode, consisting of three self-contained segments. It first aired on the Fox network in the United States on Halloween 1999. In "I Know What You Diddily-Iddily-Did", the Simpsons cover up a murder and are haunted by an unseen witness. In "Desperately Xeeking Xena", Lisa and Bart gain superpowers and must rescue Xena star Lucy Lawless from the Comic Book Guy's alter ego The Collector, and in "Life's a Glitch, Then You Die", Homer causes worldwide destruction thanks to the Y2K bug. "Treehouse of Horror X" was directed by Pete Michels and written by Ron Hauge, Donick Cary and Tim Long. The episode contains numerous parodies and references to horror and science fiction works, including Doctor Who, I Know What You Did Last Summer and Battlestar Galactica. It also features actress Lucy Lawless and actors Tom Arnold, and Dick Clark as themselves. In its original broadcast, the episode was seen by approximately 8.7 million viewers, finishing in 34th place in the ratings the week it aired. Since its airing, the episode received positive reviews from critics. Plot In the opening scene, the two aliens Kang and Kodos introduce a variety show, with a live audience consisting of aliens. While they tell jokes, canned laughter is played, but the audience appears unamused. The Simpson family is then shown watching the show on the couch, with Homer appearing as the jack-in-the-box from "Treehouse of Horror II", Marge as the witch from "Treehouse of Horror VIII", Bart as the half-fly mutant from "Treehouse of Horror VIII", Maggie is the alien/human mutant from "Treehouse of Horror IX" and Lisa is the victim of an axe murder. Lisa asks "What do aliens have to do with Halloween?" to which Maggie responds by saying "Silence!" in Kang's voice, and vaporizes her with a ray gun. I Know What You Diddily-Iddily-Did In a parody of I Know What You Did Last Summer, on a foggy evening with a full moon, the Simpsons are driving on a coastal road when Marge runs over Ned Flanders, killing him. The next day, Homer, holding Ned's corpse upright and doing his best to imitate his speech, attempts to stage his death by having Maude witness him "fall" off the Simpsons' roof. After she looks away