Jimmy Neutron (12 episodes, 2000-2001)
Carl Wheezer / Dr. Pane (6 episodes, 2000-2001)
Judy Neutron / Vox (4 episodes, 2000-2001)
Cindy Vortex (4 episodes, 2000-2001)
Goddard / Humphrey (3 episodes, 2000-2001)
Hugh Neutron (3 episodes, 2000-2001)
Sheen Estevez (3 episodes, 2001)
Libby Folfax (3 episodes, 2001)
Ms. Fowl (2 episodes, 2001)