Three chilling tales of Halloween horror unwind in the 20th anniversary of THE SIMPSONS annual “Treehouse of Horror” Halloween special airing Sunday, Oct. 18 (8:00-8:30 PM ET/ PT) on FOX. THE SIMPSONS ™ and © 2009 TTCFFC ALL RIGHTS RESERVED.

The 21st season of The Simpsons in well underway and according to Executive Producer, Al Jean, the writers are working overtime to keep the series fresh - including the much-anticipated Halloween show.

The Treehouse of Horror returns with all the blood and guts you’d demand from the yearly event with no mayhem off-limits.  And  Jean promises the episode won’t disappoint fans.

Pay close attention to the credits, too, because all those sinister Halloween names the cast and crew are assigned come from the minds of each individual person listed.

Click onto the two media bars for the upcoming Treehouse of Horror tease as well as the creepy credits explanation from The Simpsons EP, Al Jean.

The Simpsons‘ annual Treehouse of Horror airs tonight, 8:00 p.m. ET/PT on Fox.