"Treehouse of Horror XVI" is the fourth episode of the seventeenth season of the American animated television series The Simpsons. It first aired on the Fox network in the United States on November 6, 2005. In the sixteenth annual Treehouse of Horror, the Simpsons replace Bart with a robot son after Bart falls into a coma, Homer and various other characters find themselves on a reality show where Mr. Burns hunts humans for sport, and costumed Springfieldians become whatever they are wearing, thanks to a witch who was disqualified from a Halloween costume contest.