Treehouse of Horror XXVII

"**Treehouse of Horror XXVII**"
"Treehouse of Horror XXVII"
The Simpsons episode
	Promotional poster
Episode no.	Season 28; Episode 4
Directed by	Steven Dean Moore
Written by	Joel H. Cohen
Production code	VABF16
Original air date	October 16, 2016
Guest appearances
	Drew Carey as himself; Donald Fagen as himself; Kelsey Grammer as Sideshow Bob; Maurice LaMarche as Hedonismbot (VR Couch Gag only); Judith Owen as "600" Singer; Sarah Silverman as Rachel;
Episode features
Couch gag	A parody of Planet of the Apes.
Episode chronology
← Previous; "The Town"	Next →; "Trust but Clarify"
	The Simpsons season 28
	List of episodes

"Treehouse of Horror XXVII" is the fourth episode of the twenty-eighth season of the American animated television series The Simpsons, the 27th episode in the Treehouse of Horror series of Halloween specials, and the 600th episode of the series overall. The episode was directed by Steven Dean Moore and written by Joel H. Cohen. It aired in the United States on Fox on October 16, 2016.

In this episode, the children fight to spend time at a reservoir, Lisa's imaginary friend kills her real friends, and Bart joins a group of secret agents. Judith Owen and Sarah Silverman guest starred. Comedian Drew Carey and musician Donald Fagen appeared as themselves. The episode received mixed reviews.