• New article from the Springfield Shopper: Season 21 News: Marge takes up timbersports in November!
  • Only until Treehouse of Horror XXX airs!
  • Wikisimpsons has a Discord server! Click here for your invite! Join to talk about the wiki, Simpsons and Tapped Out news, or just to talk to other users.
  • Make an account! It's easy, free, and your work on the wiki can be attributed to you.
  • Welcome to Wikisimpsons!

Treehouse of Horror XXX

Wikisimpsons - The Simpsons Wiki
Season 31 Episode
665 "The Fat Blue Line"
"Treehouse of Horror XXX"
"Gorillas on the Mast" 667
XXIX "Treehouse of Horror XXIX"
"Treehouse of Horror XXX"
Treehouse of Horror Episode
For the continuing series of Halloween specials, see Treehouse of Horror series.
Treehouse of Horror XXX
Treehouse of Horror XXX promo 1.png
Episode Information
Episode Number: 666[1][2][3]
Production Code: YABF18[3][4]
Original Airdate: October 20, 2019[1][2]
Show Runner(s): Al Jean
Written By: J. Stewart Burns[5]
Directed By: Tim Bailey[6]

Days of Future Future Simpsons House.png This article is about an upcoming episode.
The article's contents may change as the episode approaches and more information becomes available. Please be cautious when adding information to this article, as rumors and speculation often get confused with fact.
Donut Homer.png This episode is considered non-canon and the events featured do not relate to the series and therefore may not have actually happened/existed

"Treehouse of Horror XXX" will be the 4th episode of season 31. It will air on October 20, 2019.[1][2]


"The 30th Treehouse of Horror features a demon Maggie, a mission to rescue Milhouse from another dimension, dead-Homer's spirit trying on some new bodies for size and Selma finally finding love in an unlikely place - the alien in the basement.[7]"


Opening sequence

In a parody mash-up of The Omen and The Exorcist, Marge gives birth to her third child, and Homer is alarmed when he finds out about his second son. Dr. Hibbert offers to swap the new born with a girl named Maggie, warning him "She tested positive for evil".

Homer and Marge bring her home, and she shows satanic powers and torments the family and the other people of Springfield. Ned vows to get rid of the evil, sacrificing her inside the First Church of Springfield, but Homer and Marge stops him. Ned however shows them the Mark of the Beast on her head, Mickey Mouse's logo.[8]

Danger Things

Set in a Springfield full of product-placement in the '80s, Milhouse (as Will Byers) is dragged into "The Over Under" dimension, where a bald Lisa (as Eleven) is sent to rescue him. A scene will feature the Starcourt Mall.[8]



Promo videos


Season 31 Episodes
The Winter of Our Monetized Content Go Big or Go Homer The Fat Blue Line Treehouse of Horror XXX Gorillas on the Mast Marge the Lumberjill
The Incredible Lightness of Being a Baby Thanksgiving of Horror Bobby, It's Cold Outside Livin' La Pura Vida Todd, Todd, Why Hast Thou Forsaken Me Hail to the Teeth The Miseducation of Lisa Simpson Frinkcoin Bart the Bad Guy Screenless Highway to Well Better Off Ned Warrin' Priests The Hateful Eight-Year-Olds The 7 Beer Itch Way of the Dog