As fans of the computer-animated Nickelodeon series may know, Jimmy Neutron has a few heroes, and one of them is the famed international super-spy known as Jet Fusion. But when Jimmy decides to do his next book report on a favorite Jet Fusion novel, he takes things a little too far -- as usual. The boy genius invents a machine that turns his hometown of Retroville into a virtual re-creation of the dangerous world of the fictional super-spy hero. Now Jimmy must embark on an adventure of exploration, platform jumping, and puzzle-solving, to save Jet Fusion from the villainous Professor Calamitus and return Retroville to it's normal state.