The Simpson's Movie
(2007)

Homer realizes that even though he was the cause of the calamity that hit Springfield, he must stop it. He returns to Springfield, revives Bart's love for him, and the two get rid of the bomb by riding a motorcycle around the Springfield dome, up to the hole in the top, and throwing it out. The explosion causes the dome to shatter, and Homer and Bart, on their way down, jump Springfield gorge and almost make it, but Bart's slingshot and Homer's waistband save them. All of Springfield is unharmed by the falling shards of Bio-Dome, except Dr. Nick. Just before the end, Homer and Bart are confronted by Mr. Cargill (A. Brooks), who is taken out by Maggie. While Springfield helps to rebuild the Simpson house, Homer and Marge ride off into the woods.

Thanks Herbmeistr!