The Simpsons/Treehouse of Horror XXI

"Treehouse of Horror XXI" is the fourth episode of the twenty-second season of The Simpsons and the twenty-first installment in the series' annual "Treehouse of Horror" Halloween specials.
==Broadcast History==
===2010===
Air Date 	Time 	Notes
November 7, 2010 	8:00pmThe Simpsons Archive	
December 19, 2010	7:30pm 	
===2011===
Air Date 	Time 	Notes
June 26, 2011	8:00pm	
==Footnotes==
Category:Guides