This year's Halloween episodes include: Bart teaming up with a band of rejected robots after being replaced while in a coma in "B.I.: Bartifical Intelligence," Homer and several male ancillary characters being hunted down by Mr. Burns as part of a reality show in "Survival of the Fattest," and a witch curses costumed townspeople after losing a Halloween contest in "(I've Grown) A-Costume To Your Face."
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* AbusiveParents: "B.I.: Bartificial Intelligence" is a WholePlotReference to ''Film/AIArtificialIntelligence'', with one important changed plot point: Homer thinks that the robot is TheAce, so he ''dumps Bart in the woods'' instead of the robot.
* AllJustADream: The events from "B.I.: Bartificial Intelligence" are Homer's dream. [[WorseWithContext While he's demonically possessed.]]
* AmoralAttorney: The Blue-Haired Lawyer, to the point of TooDumbToLive. Burns makes it pretty clear that he is going to hunt down every man that he has invited to his home, kill them and make trophies out of them, and right after pointing out how illegal it is, the Blue-Haired Lawyer drafts a letter that gives Burns a bulletproof legal defense for said killings, ''without apparently having done any attempt to bargain for his life in exchange.''
* AndKnowingIsHalfTheBattle: Spoofed by Dennis Rodman. He explains he did his "educational" cameo as community service.
* BecomingTheCostume: in "I've Grown a Costume on Your Face", a witch curses everyone in town by making them become their costumes.
* BigDamnHeroes: Marge whacks Mr. Burns and Smithers with frying pans from behind and saves Homer in ''Survival of the Fattest''. [[TheUnfairSex And then hits Homer with said pans for being out of the house all night without trying to call her.]]
* BurnTheWitch: After a witch is disqualified from a costume contest for being a real witch instead of someone wearing a witch costume, someone says "Burn her..." but it turns out he means the witch's prize instead of [[SubvertedTrope the witch herself]].
* CallBack: Yeardley Smith is credited as "[[Recap/TheSimpsonsS4E13SelmasChoice The Lizard Queen]]".
* DisproportionateRetribution: After being disqualified from a costume contest, a witch retaliates by cursing the townspeople into BecomingTheCostume.
* DisqualificationInducedVictory: The costume contest's runner-up becomes the new winner once the witch is disqualified for not wearing an actual costume.
* ForHalloweenImGoingAsMyself: The witch in "(I've Grown) A-Costume To Your Face".
* HumanShield: The robot that replaces Bart uses Homer as one to protect itself from Bart. Not that it does him any good.
* HuntingTheMostDangerousGame: In "Survival of the Fattest".
* MercyLead: Mr Burns offers this.
-->'''Burns''': Now, because I am too kind, I will give you all a five-minute head start. You may commence running!
-->'''Comic Book Guy''': Five minutes of running!? [[TemptingFate Shoot me now]]!" * ''BANG''*
* ShoutOut: One to Music/HerbieHancock's Rockit and ''Series/{{Bewitched}}''.
* TakeThat: Kang and Kodos deliver one to the Cubs.
-->'''Kang:''' (using the Accele-Ray to speed up the World Series) Faster! Faster! Until the fabric of the universe itself may shatter!
-->'''Kodos:''' Good. Only then could the Cubs win!
* UngratefulBastard: Bart finds some runaway robots on the woods that give him a place to spend the night in exchange for making them feel loved. He instead takes them apart while they're sleeping to create PoweredArmor so he can take revenge on Homer (and pees on one of them. Granted, it was a ''urinal'' robot).
* VisualPun: The robot that replaces Bart is "boot" started by being kicked by the technician who delivers him to the Simpsons.
* YouHaveOutlivedYourUsefulness: Burns' Blue-Haired Lawyer, who is arguably the most loyal employee of his (even over ''Smithers''), creates a binding contract for the game and once he signs it, is prompted executed by Burns.