"Treehouse of Horror XXIII" is the second episode of the twenty-fourth season of the American animated television series The Simpsons. It first aired on the Fox network in the United States on October 7, 2012. In the United Kingdom and Ireland, the episode aired on Sky 1 on March 24, 2013 with 1,312,000 viewers, making it the most watched program that week. The episode received a 2013 Emmy nomination for Outstanding Animated Program.