Jimmy takes a journey to a far-off comet called Twonkus 3 and some adorable alien creatures called Twonkies follow him back to Earth in his sand samples. Carl gives them away as pets, despite Jimmy's warnings. When Jimmy finds out the Twonkies become dangerous monsters when exposed to music, he and his friends must round them up and send them back to space before it's too late.
as Jimmy Neutron (voice)
as Hugh Neutron (voice)
as Judy / Vox 2000 (voice)
as Carl / Mr. Wheezer / Butch (voice)
as Sheen (voice) (as Jeff Garcia)
as Cindy Vortex (voice)
as Libby (voice)
as Ms. Fowl (voice)
as Sam / Louie (voice)
as Nick (voice)
as Nick's Singing Voice (as Jeff Gun)
as Goddard / Twonkies (voice)
as Themselves (voice)
