Homer learns his family are in Springfield and a helicopter lowers a time bomb suspended by rope through a hole in the roof of the dome. Homer enters the dome and descends the rope, knocking the escaping townspeople and the bomb off. After reuniting and reconciling with Bart, they use a motorcycle to travel up the side of the dome and Bart throws the bomb through the hole seconds before it detonates, shattering the dome and freeing the town. Cargill appears with a shotgun, attempting to kill Homer and Bart for thwarting his plans, but Maggie knocks him out by dropping a large rock on his head. The townspeople praise Homer, who reconciles with Marge as Springfield begins restoration.