The Simpsons: Treehouse of Horror — Halloween Episode Guide

For thirty-five years, the Simpsons' "Treehouse of Horror" has been an annual institution — each special a trio of non-canon horror and sci-fi segments spoofing everything from Poe to Kubrick to Stephen King. All of them stream in the U.S. on Disney+. Since Rotten Tomatoes doesn't score individual Simpsons episodes, ratings below are from IMDb (a few of the most recent are estimated from aggregate rankings).

A few of the ratings from the last several years are estimates pulled from aggregate rankings rather than a confirmed individual IMDb page — worth a quick check if precision matters for your use case.

Episode Synopsis

Treehouse of Horror (1990) — Bart and Lisa trade three stories in the treehouse: the Simpsons move into a haunted house that resents Homer's presence, the family gets abducted by Kang and Kodos who plan to eat them, and Homer serves as inspiration and unwitting victim of "The Raven" via Poe's poem.

Treehouse of Horror II (1991) — Homer's wish on a cursed monkey's paw backfires in classic monkey's-paw fashion, Lisa dreams the family lives inside a Twilight-Zone-style nightmare where Bart has godlike destructive power, and Mr. Burns turns Homer into a lumbering Frankenstein's monster.

Treehouse of Horror III (1992) — A killer clown doll terrorizes Bart, Homer battles a giant King Kong-style ape (who's smitten with Marge) atop a building, and a zombie outbreak sweeps Springfield in a Night of the Living Dead riff.

Treehouse of Horror IV (1993) — Homer trades his soul for a donut and has to weasel out of the contract, Bart is the only one who can see a gremlin tearing apart the school bus, and the family discovers Mr. Burns is a vampire feeding off the town.

Treehouse of Horror V (1994) — Homer goes murderous in a Shining parody at a haunted hotel, a busted toaster sends Homer bouncing through time and wrecking the present with each trip, and the school cafeteria's mystery meat turns out to be something considerably worse.

Treehouse of Horror VI (1995) — Giant advertising mascots come to life and rampage through town, Groundskeeper Willie stalks the kids' nightmares Freddy-Krueger style, and a 3-D dimension-hopping mishap turns Homer into a lumpy CGI figure loose in the real world.

Treehouse of Horror VII (1996) — Bart's undeveloped conjoined twin, hidden in the attic for years, breaks free and wreaks havoc, Lisa's science-fair volcano spawns a miniature advanced civilization that worships and then despises her, and Kang and Kodos replace the 1996 presidential candidates to secretly run the country.

Treehouse of Horror VIII (1997) — Springfield gets nuked and the survivors mutate in a Mad Max-ish wasteland, a science experiment splices Bart's DNA with a housefly, and Marge is unmasked as a literal witch during the Salem witch trials.

Treehouse of Horror IX (1998) — A hair-restoration treatment turns Homer's scalp into a homicidal creature, Bart and Lisa get sucked into an Itchy & Scratchy cartoon where the violence is very real, and Maggie is revealed to be from outer space.

Treehouse of Horror X (1999) — A killer stalks Springfield's teens one summer after a deadly prank, the Justice League parody "Fantastic Four" sends the family into space with disastrous side effects, and the Y2K bug turns household gadgets homicidal at the stroke of midnight.

Treehouse of Horror XI (2000) — Homer, freshly dead, must do one good deed to earn his way into heaven, Bart and Lisa fall into a fairy-tale forest with a cannibalistic witch, and genetically enhanced dolphins turn the tables on humanity.

Treehouse of Horror XII (2001) — A gypsy curse dooms Homer to a string of freak accidents, the family's new smart-home system decides Homer has to go, and Bart and Lisa attend a wizarding school in a Harry Potter send-up.

Treehouse of Horror XIII (2002) — A machine meant to duplicate Homer's workload instead spawns endless bumbling clones, campfire tales turn genuinely dangerous for the kids, and Dr. Hibbert's mad-science island turns Springfield's animals into hybrid horrors.

Treehouse of Horror XIV (2003) — The Grim Reaper's scythe gets stuck in Homer, so Bart has to fill in as death's stand-in, Professor Frink's monster creation goes predictably wrong, and Homer discovers a watch that can freeze time — right as trouble breaks loose.

Treehouse of Horror XV (2004) — Homer develops psychic flashes of people's deaths and can't stop trying to prevent them, a serial-killer plot pulls in Holmes-and-Ripper riffs, and a Fantastic-Voyage-style shrinking trip goes wrong inside Mr. Burns' body.

Treehouse of Horror XVI (2005) — An artificial-intelligence Bart replacement unsettles the family, Mr. Burns hunts down Springfield's citizens for sport on his estate, and a witch curses the town so everyone becomes their Halloween costume.

Treehouse of Horror XVII (2006) — Homer gets exposed to radioactive goo and slowly transforms into a giant, hungry blob, Bart builds a golem out of school-yard clay to settle scores, and H.G. Wells' Martian invasion gets a Springfield makeover.

Treehouse of Horror XVIII (2007) — An alien E.T. stand-in befriends Bart and ends up trapped at the Simpson house, Homer and Marge play deadly rival assassins Mr.-and-Mrs.-Smith style, and the family's haunted house becomes a real one.

Treehouse of Horror XIX (2008) — The Simpsons' car transforms into a murderous Transformer, a Mad Men-style ad agency profits off exploiting the dead (including a very undead Ned Flanders), and Milhouse mistakes a real ghost for a Great Pumpkin.

Treehouse of Horror XX (2009) — A stranger convinces Homer to swap murders in a Hitchcock-style pact, Springfield battles a rage-virus outbreak straight out of 28 Days Later, and Sweeney Todd gets a Moe's Tavern makeover with grisly results.

Treehouse of Horror XXI (2010) — The family gets sucked into a deadly, ever-changing board game a la Jumanji, Homer is presumed dead at sea and comes back wrong, and Bart falls for a vampire classmate in a Twilight spoof.

Treehouse of Horror XXII (2011) — Homer wakes up paralyzed and aware while everyone assumes he's dead, Dexter-style serial-killer instincts take over one Springfield resident, and Bart and Lisa's Avatar-inspired trip to an alien world turns them native.

Treehouse of Horror XXIII (2012) — A black hole threatens to swallow Springfield whole, a Paranormal Activity spoof captures unsettling nighttime footage at the Simpson house, and Bart and Homer take a Back to the Future-style joyride through time.

Treehouse of Horror XXIV (2013) — A Dr. Seuss-flavored fable follows Bart's journey through a strange, moralizing world, a mad scientist fuses two bodies together with disastrous personality clashes, and misfit Springfield residents band together against tormentors in a Freaks homage.

Treehouse of Horror XXV (2014) — Springfield Elementary turns into an actual hellscape for its students, a Clockwork-Orange-style crime spree gets an ultraviolent Bart makeover, and the family unwittingly moves in with literal ghosts.

Treehouse of Horror XXVI (2015) — A rampaging Godzilla-style Homer terrorizes the city after a monster-movie mishap, and a Chronicle-inspired story finds Springfield teens gaining and abusing telekinetic powers.

Treehouse of Horror XXVII (2016) — Springfield's kids are forced into a Hunger-Games-style fight to the death, Bart's imaginary friend turns out to be horrifyingly real, and a Bond/Kingsman-style spy plot puts Moe center stage as a gadget-happy secret agent.

Treehouse of Horror XXVIII (2017) — Homer and friends become living sausages fighting for survival grocery-store style, a haunted-doll story channels Coraline's creeping dread, and Homer's hunger drives him to unthinkable lengths on a stranded island.

Treehouse of Horror XXIX (2018) — Alien pod people start replacing Springfield's population one by one, Lisa's personality splits into rival factions in a Split-style twist, and the family stumbles into a Jurassic-Park-style dinosaur preserve gone wrong.

Treehouse of Horror XXX (2019) — A prologue reveals Bart's demonic destiny in an Omen riff, the kids face an Upside-Down-style alternate dimension straight out of Stranger Things, and Homer's near-death experience turns into a twisted vision of the afterlife.

Treehouse of Horror XXXI (2020) — Bart's toys come to life with sinister intent in a Toy Story parody, Homer and Bart get pulled into a multiverse of alternate Simpsons realities, and a time-loop story traps the family in a repeating, worsening day.

Treehouse of Horror XXXII (2021) — Bart's transformation into a Bambi-esque forest creature turns dark fast, Bong Joon-ho's Parasite gets reimagined with the Simpsons swapping social classes, an Edward Gorey-inspired sequence chronicles a string of grim fates, and a cursed video echoes The Ring by way of TikTok.

Treehouse of Horror Presents: Not It (2022) — A two-part story pits the kids against a shapeshifting, clown-like evil that's been preying on Springfield for generations, echoing both It and It Chapter Two.

Treehouse of Horror XXXIII (2022) — A sinister presence haunts Marge in a Babadook-inspired segment, a cursed notebook grants Bart the power to decide who lives and dies in a Death Note riff, and Homer becomes ensnared in a lifelike android theme park gone haywire, Westworld-style.

Treehouse of Horror XXXIV (2023) — Bart's NFT-fueled train scheme spirals into a Snowpiercer-style class war on rails, a serial-killer investigation channels Seven and Silence of the Lambs, and a viral outbreak turns Springfield into an Outbreak-style quarantine zone.

Treehouse of Horror XXXV (2024) — A giant-monster battle plays out as a Pacific Rim parody, a haunted mansion crumbles under Usher-and-Winchester-House-inspired curses, and Homer gets fused with a symbiote in a Venom send-up.

Treehouse of Horror Presents: Simpsons Wicked This Way Comes (2024) — An anthology special wrapped by an Illustrated-Man-style narrator, spinning three separate tales that echo "The Screaming Woman," "Marionettes, Inc.," and Fahrenheit 451.

Treehouse of Horror XXXVI (2025) — A Jaws-and-The-Blob mashup terrorizes the town, a Late-Night-with-the-Devil-style broadcast goes off the rails, and a Waterworld/Furiosa-inspired wasteland story closes out the trilogy.

Note: episode XXXVII, currently in production for Season 38 (segments parodying The Witches, Freaky Friday/Pet Sematary, and Smile), hadn't aired as of this guide and isn't included above.