In "Geriatric Park", Mr. Burns starts a retirement home. The elderly people in it have their DNA mixed with dinosaurs' DNA. The elderly have been shown to be more healthy and stronger. Homer makes the temperature hotter, which makes the elderly turn into dinosaurs. Mr. Burns and many of the visitors are killed by the dinosaurs. The Simpson family tries to get away from their grandparents, Grampa and Jacqueline. Lisa learns that they can stop the dinosaurs by being nice to them. The family later gets away from the dinosaurs without being hurt.