Unlike Season 2 or 3, Season 1 of Jimmy Neutron takes a more comical approach to the show, with little development of Jimmy and Cindy's relationship. * Jimmy Neutron, Sheen Estevez, and Carl Wheezer were present for all episodes. * Libby was absent for 5 episodes. * Cindy was absent for 4 episodes. * Goddard, Hugh, Judy were absent for the season finale.