4 Treehouse of Horror XIX

In the opening scene, Homer tries to vote for Democratic candidate Barack Obama in the 2008 American presidential election. However, the voting machine is rigged to turn his vote into one for Republican candidate John McCain. After six attempts to vote, Homer heads out to report the mishap, but the machine sucks him in and kills him to hide the truth, then shoots his body out of the voting booth. Jasper sticks a patriotic-themed "I voted" sticker on Homer's forehead.

In a parody of Transformers, Bart buys Lisa a Malibu Stacy convertible as a Christmas present. However, the car turns out to be a Transformer. The robot transforms all of the technology in Springfield into robots so they can wage war with each other. Just as the two machine factions' leaders prepare to face off, Marge asks why the robots are at war with one another; as it turns out, they cannot even remember. Thanking Marge, the two sides declare that they will work together, only for a robot to shout "we should team up to enslave your planet!" The two factions of sentient machines work together to overthrow humanity and use Springfield's residents in a game of human foosball.

Homer takes Maggie to a daycare and encourages her to enjoy a mural featuring Krusty the Clown to make her feel better while she is away from her parents. However, Krusty arrives to have the images of his face sandblasted from the mural, as his likeness is trademarked and used without his permission. This left Maggie upset and an outraged Homer shoves Krusty in retaliation, sending him flying into a wood chipper and shredded alive. Homer is later approached by two advertising agents who have heard of his deed and explain their plan to use celebrities' likenesses in advertising without issues over permission by simply killing the celebrities who refuse to lend their names to advertising. Homer is then hired as a celebrity assassin, taking out such famous faces as actor George Clooney, singer Prince, and astronaut Neil Armstrong. In Heaven, the dead celebrities are outraged by this and stage an attack on the living, with Homer as their main target. Krusty's angel kills Homer, who gets revenge by locking all the celebrities out of Heaven, leaving only himself and the apparently gay Abraham Lincoln.

In a parody of It's the Great Pumpkin, Charlie Brown, Milhouse waits in a pumpkin patch on Halloween for the Grand Pumpkin (which Bart made up) with Lisa. After Lisa sees everyone at school having a Halloween party, she grows tired of waiting and leaves in frustration. Milhouse starts to cry and his tears and childlike belief bring the Grand Pumpkin to life. However, the Pumpkin is appalled to find that his kindred pumpkins are being carved up on Halloween and made into pumpkin bread, and vows revenge. He devours Homer as he carves a pumpkin, then marches to the school and eats Nelson and Groundskeeper Willie. Realizing that Milhouse can bring things to life by believing in them, Lisa tells him about "Tom Turkey", a symbol of Thanksgiving. Milhouse starts to believe in Tom Turkey, who comes to life and kills the Grand Pumpkin, freeing everyone he ate. However, when Tom Turkey learns that people eat turkeys on Thanksgiving, he vows revenge and starts angrily chasing children around the school, devouring some of them whole as Marge wishes the viewers happy holidays.