Treehouse of Horror X [SEP] series
Treehouse of Horror X
"Treehouse of Horror X" is the fourth episode of "The Simpsons"' eleventh season, 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", Bart and Lisa gain superpowers and must rescue
aired on October 25, 1990 and was inspired by EC Comics Horror tales. Before "Treehouse of Horror XI", which aired in 2000, every episode has aired in the week preceding or on October 31; "Treehouse of Horror II" and "Treehouse of Horror X" are the only two episodes to air on Halloween. Between 2000 to 2008 and 2010, due to Fox's contract with Major League Baseball's World Series, several episodes have originally aired in November; as of 2011 every "Treehouse of Horror