Episode - 3F04\\
First Aired - 10/29/1995

In this year's tales of terror, Springfield is overrun by oversized advertising, Groundskeeper Willie becomes a Freddy Krueger-esque dream killer, and Homer hides from his sisters-in-law...and finds himself in the third dimension.
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!!Treehouse of Horror VI contains examples of (YMMV tropes can be found [[YMMV/TheSimpsonsS7E6TreehouseOfHorrorVI here]]):

* AbandonedPlayground: Bart battles Willy at night in a foreboding, nightmare playground which is empty until the battle.
* AlternateUniverse: The infamous third act of this episode shows Homer entering another dimension, which collapses and leaves him stuck in another universe, namely ours.
* AluminumChristmasTrees: The film ''Film/{{Tron}}'' was considered this in 1995. When the episode first aired, a lot of fans simply thought that Homer made up the film to describe the third dimension, due to everyone denying that they ever saw it. The release of ''VideoGame/KingdomHeartsII'' over a decade later, which contains a world based on the film, gave quite a shock to a lot of ''Simpsons'' fans who weren't old enough to remember that movie.
** It happened again in 2010, with the release of ''Film/TronLegacy''.
* AmbiguousSyntax and AccidentalInnuendo: "'Do not touch Willie.' Good advice."
* ArtShift: "Homer³" contains probably the most notable example in Simpsons history, with Homer (and later, Bart) being depicted in CG animation for the first time. Homer lampshades how expensive it was.
** Bart's first dream in "Nightmare on Evergreen Terrace" is depicted in the style of an old ''LooneyTunes'' and/or Creator/TexAvery short.
* ArtisticLicensePhysics:
** When Homer tries to flee from Patty and Selma he lifts the carpet, only to see Santa's Little Helper and Snowball hiding underneath the nevertheless totally flat surface.
* AttackOfTheKillerWhatever: Giant advertising mascots in "Attack of the 50-Foot Eyesores".
* BuffySpeak: "It's like something out of the twilighty show about that zone."
* CartridgesInFlight: In "Homer³", Chief Wiggum fires his pistol into the third dimension. The bullets appear in 3d, casing and all, before being sucked into the black hole.
* ContinuityNod: The first act ends with Homer saying "[[Recap/TheSimpsonsS5E11HomerTheVigilante we'll be right back]]".
* DimensionalTraveler: Homer in the third act of this episode.
* DreamSequence: The second act is full of them, with Bart fighting Groundskeeper Willie in his dreams.
* TheEndOrIsIt: Lisa thinks that Willie will come back...[[spoiler: And he does. Subverted in that he left his gun on the bus he arrived at the Simpsons house on, and he has to run back and get it.]]
* DeadlineNews: In "Attack of the 50-Foot Eyesores" Kent Brockman gets attacked by a giant advertising-icon-turned-moving-rampaging-monster version of himself before it cuts to WeAreExperiencingTechnicalDifficulties. However, he appears to be fine by the end.
* EroticEating: Inverted into FanDisservice in "Homer³" when Patty and Selma find out that they can suck the many-days-dead conches and hermit crabs out of their shells to clean their seashell collection.
* EvilLaugh: Willie gives one.
* GiantSpider: Willie's final form.
* JustIgnoreIt: How Paul Anka and Lisa fight back against the giant ads in "Attack of the 50-Foot Eyesores".
* OhCrap: A flipping cone hits Homer's butt. He tells it to "watch it" and throws it away, landing point first, causing the dimension's collapse.
-->'''Homer:''' Oops.
* [[spoiler:RogerRabbitEffect: The ending of "Homer³"]]
* RealWorldEpisode: Homer is sucked out the Simpsons universe and disappears. According to Reverend Lovejoy he has gone "to a better place", which turns out to be our universe.
* ScrewThisImOuttaHere: When Willy returns in his OneWingedAngel form, Krusty decides to get away as fast as he can.
-->'''Krusty:''' Don't dream about me no more, kid!
* ShootTheMoney: "Homer³", with CG animation.
-->'''Homer:''' Gee, this place looks expensive. I feel like I'm wasting a fortune just standing here! Better make the most of it. ''[{{Beat}}] [scratches himself]'' *BURRRRRRRP*
* ShoutOut:
** When the first advertising mascot comes to life he lets out a MightyRoar, which is actually Franchise/{{Godzilla}} 's SignatureRoar.
** "That's weird...it's like something out of the [[TwilightZone twilighty show about that zone]]...". Incidentially, this line is from "Homer³", and its plot is a ShoutOut of ''The Twilight Zone'' episode "Little Girl Lost", where a little girl ends up in the fifth dimension.
** "Nightmare on Evergreen Terrace" is one long reference to the ''Franchise/ANightmareOnElmStreet'' films.
** The library from ''{{Myst}}'' is in the third dimension. A rendition of the closing theme and the music over the Gracie Films logo are also done in the style of ''Myst''.
** The title of "Homer³" is a homage to ''[[Film/{{Alien 3}} Alien³]]''.
** The title of "Attack of the 50-Foot Eyesores" is a reference to the BMovie ''Film/AttackOfThe50FootWoman''.
** Going the other way around, Homer's "Holy macaroni!" from "Homer³" got SampledUp at the end of the Bloodhound Gang song "Mope".
** The third dimension itself partly resembles a [[{{DeliberatelyMonochrome}} colored version]] of the computer system from ''[[{{Film/Tron}} Tron]]''. This is [[{{LampshadeHanging}} even brought up by Homer himself]] when he asks everyone if they saw the film; [[TakeThat no one did]].
** Groundskeeper Willie taking on different forms before he sinks into the abyss references the end of ''Film/Terminator2JudgmentDay'', where the Terminator does the same while melting away.
** As Groundskeeper Willie runs after the bus, the music is the Simpsons theme done in the style of "Yakety Sax", ''Series/TheBennyHillShow'' closing theme.
* TalkingWithSigns: Seen in "Nightmare on Evergreen Terrace": After seeing Groundskeeper Willie (playing the role of Freddy Krueger) for the first time, Bart holds up a sign that reads: "Eep."
* ThirteenIsUnlucky: The story of "Nightmare on Evergreen Terrace" starts "on the thirteenth hour of the thirteenth day of the thirteenth month" with a meeting to [[LampshadeHanging discuss the misprinted calendars]] bought by the town.
-->'''Homer:''' "Oh, lousy Smarch weather."
* TrappedInAnotherWorld: Homer stumbles into another dimension and is unable to get out.
* UnwittingInstigatorOfDoom: If Homer hadn't messed with the thermostat, Willie wouldn't have died and sworn vengeance against everyone.
* VillainDecay: Willie has come back to life (somehow) and attempts to threaten the Simpson children again but is now much less competent than he was while he was a spirit, losing both his gun and one of his shoes.