Peppa and her family unexpectedly find themselves transported from their own universe to the world of The Simpsons, landing in Springfield. There, right outside Moe's Tavern, they come face to face with the iconic Simpsons family: Homer, Marge, Bart, and Lisa, while little Maggie stays at home. In a surprising twist, Homer and Daddy Pig engage in a musical competition titled "Unlikely Rivals." Both families, who never anticipated being in a rivalry due to their vastly different backgrounds, are now set to resolve their differences through music. It appears that this encounter will be settled in a harmonious showdown between Homer and Daddy Pig.