Retroville's resident boy genius knows a lot about science, but not so much about life. He thinks anything can be solved with a mathematical equation or a new invention, built his own robot dog, Goddard, and uses his best friend Carl as a guinea pig for his experiments. Genius aside, Jimmy is your typical kid: He takes his parents for granted (until he needs them), enjoys hanging out with his pals Carl and Sheen, and is in constant competition (or is it infatuation?) with Cindy Vortex, the smartest girl in Retroville. Oh, and not counting his gravity-defying hairdo, Jimmy's the shortest kid in class and has to be in bed by nine.