"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. A spin-off comic book series based on the segment "Desperately Xeeking Xena", entitled Simpsons Super Spectacular, has been published by Bongo Comics since 2005.
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