[Wikipedia] Mysterious happenings are occurring in Springfield; a horde of robot wasps descend upon the city at the beginning of the game. After a tractor beam kidnaps Bart outside a stadium, Lisa attempts to find her brother by exploring the town for clues. She learns that the black sedans that have been appearing around town are connected to Bart's disappearance. Lisa eventually finds Bart on a ship in Springfield harbor. He appears to have memory loss and is mumbling unintelligibly while occasionally mentioning the sedans and Buzz Cola, the "new and improved" cola drink recently launched by television personality Krusty the Clown. Marge sets out to learn what has affected Bart. As she investigates a crop circle that recently appeared in Cletus Spuckler's crop field, Abraham Simpson tells Marge that the crop circle is an exact replica of the Buzz Cola logo. Marge gives a can of the cola to Bart, which snaps him out of his stupor. Bart reveals that the new Buzz Cola is a mind-control cola produced by aliens. Marge decides to purge Springfield of the cola, but in spite of her valiant efforts, the drink still maintains its popularity.[5]

Inspired by Marge's efforts and remorseful for selling the cola in the first place, Apu tries to discover the source of the cola. Snake Jailbird tells him that the cola trucks are registered to the Springfield Museum of Natural History. Apu and Bart decide to go inside the museum, where they find a meteor as the source of the cola. They eavesdrop on a conversation between aliens Kang and Kodos, who are masterminding a scheme. Apu and Bart learn that the wasp cameras are filming the antics of Springfield for an intergalactic reality show, Foolish Earthlings. The aliens are using the cola to make people insane, by which time Kang and Kodos will distribute laser guns among the populace to drive the town to a violent massacre sure to draw many viewers.[5]

Bart takes it upon himself to foil Kang and Kodos' plan. He asks Krusty for help, but Krusty informs Bart that he has already helped the Duff Brewery set up free laser gun stands around Springfield. Bart then goes to his father, Homer, for help, and the duo quickly pursue Kang and Kodos to the brewery. However, the aliens escape, and before departing, they reveal that they have already released Buzz Cola throughout Springfield's water supply. As the cola seeps into the ground, it releases the un-dead from the Springfield Cemetery, who invade Springfield. When Homer collects supplies to protect his family and home from the marauding zombies, he decides to pursue a black sports car—which he believes belong to the aliens—to the Springfield Nuclear Power Plant. The car, however, belongs to Professor Frink, who has discovered the aliens' weakness: nuclear waste. He plans to use the space ship's tractor beam to suck up cars that are loaded with drums of nuclear waste. After successfully loading Frink's car, along with three more, into the aliens' tractor beam, the ship explodes. The following day, Springfield is returned to normal.