how many simpsons treehouse of horrors episodes are there
List of The Simpsons Treehouse of Horror episodes As of 2016, there are twenty-seven Treehouse of Horror episodes, with one airing every year. They are known for being more violent than an average Simpsons episode and contain several different trademarks, including the alien characters Kang and Kodos who have appeared in every episode. Quite often the segments will parody well-known movies, books, radio shows, and television shows. The Twilight Zone has been parodied quite often, and has served as the inspiration for numerous segments.[9]