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, [[spoiler: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. [[LeaningOnTheFourthWall 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".
* BittersweetEnding: "Homer³" has the dimension collapse and Homer fall into the hole [[spoiler:and wind up in our world. But hey, he found an erotic cake store seconds after arriving...]]
* BuffySpeak: "It's like something out of [[Series/TheTwilightZone 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.]]
* EpicFail: Homer ''trying;; to jump to Bart near the end of "Homer³". If you can call it that, anyway...
* 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. [[UnexplainedRecovery 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.
* TheFourthWallWillNotProtectYou: "Attack of the 50-Foot Eyesores" ends with Kent Brockman warning viewers that "the next advertisement you see could destroy your house and eat your family!" And then...
-->'''Homer''': (leans into frame) We'll be right back. ([[{{Troll}} shiteating grin]])
* GiantSpider: Willie's final form.
* GoodAngelBadAngel: Inverted in "Attack of the 50-Foot Eyesores", with Bart on a giant devil mascot's shoulder telling it to destroy the school.
* INeverSaidItWasPoison: When Bart and Lisa bring up Marin dying in school, Marge says that she doesn't see how it involves Groundskeeper Willie. Note that I never said they brought ''him'' up.
* JustIgnoreIt: How Paul Anka and Lisa fight back against the giant ads in "Attack of the 50-Foot Eyesores".
* NiceJobBreakingItHero: Homer throwing the cone away, tip first, causes the dimension to collapse.
** In a way, so does him running ''away'' from the side of the dimension where he entered when the collapsing speeds up. He was too far away from Bart when he went in to get him. And his attempt to ''jump'' to Bart failed.
* OhCrap: A flipping cone hits Homer's butt. He tells it to "[w]atch it" and throws it away, landing point first, causing the dimension's collapse.
-->'''Homer:''' ''Oops.''
* [[spoiler:RogerRabbitEffect: The ending of "Homer³"]]
* [[spoiler: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.]]
* RoaringRampageOfRevenge: The advertising mascots in "Attack of the 50-Foot Eyesores" attack Springfield because Homer stole the Lard Lad donut. Marge figures that giving the donut back will make them stop, so they do. For a second. [[MotiveDecay And the rampaging continues regardless.]]
* 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:''' [[LeaningOnTheFourthWall 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 [[Series/TheTwilightZone 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 ''VideoGame/{{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 sampled 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.
* SweepingAshes: After Willie turns to ash in "Nightmare on Evergreen Terrace", he handily sweeps himself into a dustpan and throws himself away.
* 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."
* TakeThat: When Homer asks if anyone saw ''Film/{{Tron}}'', everyone says no. (Chief Wiggum even says it twice, then says "yes" before correcting himself.)
* TemptingFate: "Hey, Lard Lad! I got your giant donut, and there's nothing you can do about it!" Except come to life and wreck the town.
* 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.
* UnusuallyUninterestingSight: Homer doesn't freak out at all when the Lard Lad statue comes to his door.
-->'''Homer:''' He came to life. Good for him.
* UnwittingInstigatorOfDoom: If Homer hadn't messed with the thermostat, Willie wouldn't have died and sworn vengeance against everyone.
** Also, while Homer taking the Lard Lad statue's donut didn't technically bring it to life, it was the reason it and all the other mascots went on the rampage.
* UpTheRealRabbitHole: [[spoiler:"Homer³" ends with Homer landing in our world, which he calls "the worst place yet."]]
* VillainDecay: [[spoiler: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.]]