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Milhouse of Sand and Fog
Treehouse of Horror XVI
Marge's Son Poisoning
Treehouse of Horror XV
Treehouse of Horror XVI
Treehouse of Horror XVII
Donut Homer.jpg This episode is considered non-canon, and the events featured are not part of the timeline of the series' continuity.

For the continuing series of Halloween specials, see Treehouse of Horror series.

Dad, you're not a robot. You're just possessed by the Devil.
Lisa Simpson[src]

Treehouse of Horror XVI is the fourth episode of Season 17 as well as the sixteenth Halloween episode (originally going to be an episode of Season 16).


In "B.I. Bartificial Intelligence" Bart lapses into a coma, Homer and Marge replace him with a robot boy. Homer competes in "The World Series of Manhunter" with Mr. Burns hunting him, and Terry Bradshaw as the host in "Survival of the Fattest". A witch casts a spell at a Halloween costume party, turning everyone into what their costume is in "I've Grown a Costume on Your Face".

Full Story


Using an accelerator-ray, Kang and Kodos hope to speed up a World Series baseball game to air The Simpsons. Things later go sour, as the baseball players go so fast that they turn into a killer vortex and the baseball stadium is drawn in to a specific point where the gravity is high. Afterwards, the stadium's surroundings are drawn into this point. The whole city of Springfield follows, then Earth's oceans, the whole Earth, the solar system, numerous galaxies and finally God is drawn into this singularity, a form of a Big Crunch. Kodos says to Kang, "Smooth move, space-lax! You've destroyed the totality of existence." Kang replies, "It will be fine. I'll just leave a note." The Yellow Post-it note he places says: "Treehouse of Horror XVI" in red writing that looks like blood.

B.I. Bartificial Intelligence

B.I. Bartificial Intelligence title card

In a parody of A.I. Artificial Intelligence, Bart ends up in a coma after attempting to jump from the roof to the swimming pool at Spinster Arms Apartments. In an effort to cope with the loss of their son, the family takes in a robotic boy, named David, who quickly proves to be a better son.

B.I. Bartificial Intelligence promo card

Later, Bart wakes up from the coma; however, he and David soon try to compete for their family's love. In the process, David uses his skills at robot to upstage Bart in every way, shape and form much to Bart's anger (with the exceptions of the soft serve ice cream David made for everyone winning over Bart's fellow classmates). Marge grows concerned with the boys' rivalry; Homer comforts her and says he will fix it, by planning to dump Bart in the woods. Bart soon comes across a band of defunct robots; while they sleep, he harvests their parts to become a powerful cyborg. He returns home to seek his revenge on David. The family is surprised by the modifications Bart had made to himself, and Marge is angry, as Homer claimed he sent Bart to culinary school. Bart confronts David, ready to destroy the automaton for stealing his life. David grabs Homer and uses him as a shield, claiming that if Bart wants to destroy him, he will also have to harm Homer. Since Homer dumped him in the middle of the woods and ran off, Bart is all too happy to simply cut though Homer to kill David. Eventually, Homer, who no longer has his own legs, now has to be fused with David's legs. In the end it is revealed that it was all a dream induced by Homer's demonic possession, in a parody of The Exorcist. A priest comes and splashes holy water on Homer who begins to preform the exorcist movements and music, and climbs up on the ceiling. Marge calls the plant to tell them that Homer won't be able to come in, and Homer exclaims "Whoo-hoo!" and collapses on the bed, relaxed, but with his head still turned around backwards.

Survival of the Fattest

Survival of the Fattest title card

TV guide for the hunt

In a parody of The Most Dangerous Game and Survival of the Fittest, Homer and the other citizens of Springfield receive a letter from Mr. Burns to come to his mansion to go hunting. Homer goes, despite his family's warnings. Unbeknownst to them, they are the prey to be hunted by Burns. After his lawyer writes something that "should work in just about every courtroom" (and is then shot by Burns), he gives everyone five minutes vantage (except Comic book Guy who sarcastically says he would rather be shot right then and there, so he is), but even so he manages to kill almost everyone, some of who climbed a tree but were launched into the air by Homer, and shot by Burns (except for Moe, who dies because he is impaled on a weather vane and being crushed by a dead Chief Wiggum).

1st promo card

2nd promo card

While the Simpson family watch the hunt on TV, the survivors hide in a forest, in which Professor Frink is eaten by Homer and everyone but him is shot by Burns' attack helicopter. Homer manages to survive the night as his friends are killed, and he uses Barney's dead body so Burns thinks he is Homer. He falls from a tree and Burns is ready to shoot at him, but just as he is about to do it, he and Smithers are both knocked out with frying pans by Marge, who then hits Homer for being away from home for eighteen hours and not calling home once. Homer can't stay mad at Marge as the pan she hit him with smells like sausages and onions. Marge replies by admitting that she is grateful that Homer is okay.

Homer and Marge kiss each other at first, but then go as far as deciding to make out with each other. One reporter asks Terry Bradshaw what his thoughts are on what had just transpired. Terry Bradshaw considers this a disgrace, as the network will show a dozen gruesome murders, but bets that they will cut to commercial before Homer and Marge begin to have sex, describing it as "the tender act of love." He is interrupted by Homer unzipping Marge's dress while making out with her, with Terry noting that he is spoken too soon, turning around quickly, cheering at both performing sex, excitedly saying "There they go", blocking the viewer from what is shown. It ends with him shockingly saying that what he is seeing is going in his Playbook, as he watches both continue to have sex on national television.

I've Grown a Costume on Your Face

I've Grown a Costume on Your Face title card

In a parody of Halloweentown II: Kalabar's Revenge and the classic Twilight Zone episode "The Masks", the citizens of Springfield dress in their Halloween costumes for a costume contest. A wicked witch also entered, and won. However, she reveals that she isn't wearing a costume, and is really a witch. She is disqualified and her prize is taken away from her. In revenge, she turns everyone into the actual characters that their costumes are based on. All the citizens have problems with their appearances, including the Simpsons: Homer's head falls off, Marge turns into a skeleton (but with her human head), Bart into a werewolf, Lisa into Albert Einstein and Maggie into a witch (as they were all dressed like that). Lisa tries to discover how to reverse the spell, but then she realizes Maggie is now a witch and she can do it. The citizens come to their house, some say they like their appearance and abilities, and some say they want to be back to normal.

Maggie turns everyone into pacifiers

Maggie gets confused, so she eventually turns the people of Springfield into pacifiers with their normal heads and goes away on her broomstick. Moe then tells the audience that he hopes they have enjoyed watching this year's Halloween episode and gives with a brief public service announcement on adult illiteracy. Dennis Rodman (who is also a pacifier) comes and says he is working off a speeding ticket. Maggie comes back and casts another spell and the credits appear, presumably changing everyone back to normal.

Behind the Laughter

The logo for this episode

Promo picture for this episode

Broadcasting Information


  • 1st Airdate: Sunday, November 6, 2005


  • 1st Airdate: Sunday, December 18, 2005
  • 2nd Airdate: Friday, December 23, 2005 (Encore Screening)
  • 3rd Airdate: Saturday, April 22, 2006
  • 4th Airdate: Tuesday, June 6, 2006
  • 5th Airdate: Friday, August 4, 2006
  • 6th Airdate: Saturday, August 26, 2006
  • 7th Airdate: November 5, 2010
  • 8th Airdate: February 2, 2013


  • 1st Airdate: Tuesday, February 28, 2006


  • 1st Airdate: Sunday, August 6, 2006


  • 1st Airdate: Sunday, October 26, 2006
  • 2nd Airdate: Sunday, October 25, 2007
  • 3rd Airdate: Sunday, October 19, 2008
  • 4th Airdate: Sunday, October 18, 2009
  • 5th Airdate: Sunday, October 17, 2010
  • 6th Airdate: Sunday, October 23, 2011
  • 7th Airdate: Sunday, October 19, 2012
  • 8th Airdate: Sunday, October 20, 2013


Treehouse of Horror series
Season 16 Season 17 Episodes Season 18
The Bonfire of the ManateesThe Girl Who Slept Too LittleMilhouse of Sand and FogTreehouse of Horror XVIMarge's Son PoisoningSee Homer RunThe Last of the Red Hat MamasThe Italian BobSimpsons Christmas StoriesHomer's Paternity CootWe're on the Road to D'oh-whereMy Fair LaddyThe Seemingly Never-Ending StoryBart Has Two MommiesHomer Simpson, This is Your WifeMillion-Dollar AbieKiss Kiss Bang BangaloreThe Wettest Stories Ever ToldGirls Just Want to Have SumsRegarding MargieThe Monkey SuitMarge and Homer Turn a Couple Play