When Mr. Krupp have landed into Springfield and have to get back, because Homer Simpsons is doing his job! Now George and Harold go in Homer's world to get Mr. Krupp back!
But when Tippy Tinkletrousers teams up with Mr. Burns to take over both dimensions, Homer and his family have to stop Mr. Burns in Piqua and George and Harold have to stop Tippy and Mr. Mechanic in Springfield.