Krusty, refusing to submit to Bob's demands, takes refuge in a civil defense shack in the desert, which he uses to transmit a heavily improvised show. Lisa deduces that the unusually high-pitched voice of Bob in his broadcast was due to inhaling helium, and locates him in the envelope of the Duff Blimp. Bob, having lost his patience thanks to Krusty, tries to detonate the bomb, which turns out to be a dud (it had passed the expiration date of November 1959). Lisa alerts the police to Bob's location, but Bob deflates the blimp and kidnaps Bart, before stealing the original Wright Brothers aircraft, which had been an exhibit at the air show. Bob attempts to carry out a kamikaze attack against the civil defense shack where Krusty is hiding, but the slow-moving plane ends up merely bouncing harmlessly off the shack. The authorities quickly arrest Bob and take him into custody while Bart is reunited with his family.