Plot: Homer adopts a pig who's run away from Krusty Burger after Krusty tried to have him slaughtered, naming the pig "Spider Pig." At the same time, the lake is protected after the audience sink the barge Green Day are on with garbage after they mention the environment. Meanwhile, Spider Pig's waste has filled up a silo in just 2 days, apparently with Homer's help. Homer can't get to the dump quickly so dumps the silo in the lake, polluting it. Russ Cargill, the villainous boss of the EPA, gives Arnold Schwarzenegger 5 options, forcing him to choose 4 (which is, unfortunately, to destroy Springfield) and putting a dome over Springfield to prevent evacuation. Homer, however, has escaped, along with his family. Can he stop the evil Cargill from annihilating his home town, and his family, who have been forced to return to Springfield?

Tags: actor, actor playing himself, actor playing multiple roles, actress playing male role, alaska, alcoholics anonymous, anger, angry mob, animate tree, attempted murder, austria, avalanche, barge, based on cult favorite, based on tv series, blockbuster, bomb, bong, botox, boy, brother sister relationship, bully, camera phone, canyon, carnival, carnival barker, cat and mouse, character name in title, child nudity, church, cinema, commercial, concert, doctor, dog, dog attack, dog cartoon, dome, dome, dome, domed city, dysfunctional family, environmental crime, environmental issues, environmental protection agency, environmental protection agency, environmental protection agency, environmental protest, eskimo, explosion, family, famous song, fast food, father son relationship, fire, food, gag, gay character, gay couple, genocide, german accent, girl, hamburger, heavy accent, helicopter, hole, homosexual, hotel, house, humor, humour, husband wife relationship, husky dog, inuit, lake, mafia, male female relationship, male frontal nudity, man wife relationship, mob, mob hit, mob scene, monster, moon landing, motor bike, motorcycle, motorcycle stunt, multiple cameos, murder, music, mutation, neighbor, no opening credits, northern lights, obscene finger gesture, penis, pickup truck, pig, popcorn, president, public nudity, returning character killed off, sandbox, sandwich, scene during end credits, self referential, sequel mentioned during end credits, siamese twins, silo, sinkhole, skateboard, small town, snow, social satire, springfield, squirrel, strauss also sprach zarathustra, studio logo parody, studio logo segues into film, surprise after end credits, surprise during end credits, the simpsons, theatre, timebomb, torch, toxic waste, tree, treehouse, u.s. president, underage drinking, underage smoking, vigilantism, walk on ceiling, wrecking ball, show all tags.