Jimmy Neutron (voice)
Carl Wheezer / Yokian Fleet Commander / Yokians / Retroland Workers (voice)
Cindy Vortex (voice)
Libby Folfax (voice)
Nick Dean (voice)
Judy Neutron / Benny / Vox (voice)
Hugh Neutron (voice)
Sheen Estevez (voice)
Goddard (voice)
Ms. Fowl (voice) (uncredited)