Treehouse of Horror

The Simpsons' annual Halloween episode has become a classic in many families. They have three separate story lines in each episode. There have been 20 episodes as of 2009 and there will be a 21st on November 7th, 2010. So they have had 21 altogether in 22 seasons. Kang and Kodos are aliens and they appeared in the very first Treehouse of Horror. In the credits the producers and whatnot's names have been changed to "scary names." Treehouse of Horror VI was nominated in the Outstanding Animated Program (For Programming less than One Hour)" category.