In the movie people keep making pollution in Lake Springfield. Lisa is angry and persuades the Mayor to put barricades around the lake. Homer dosen’t get it and dumps a silo of pig poo in the lake. EPA put a dome over Springfield. They go through the sink hole and appear outside the dome. They run to a place to win a truck and they win it. They drive to Alaska and buy a house. The TV comes up that the goverment is going to blow up Springfield! Homer dosent want to so the rest of them go. Homer is sad so tries to find them. He takes the bomb and blows up the…….Dome! After everyone fixes the Simpsons’ house.