• Irwin as Jimmy Neutron
  • Fat Timmy Turner (from The Fairly OddParents episode "Just Desserts") as Carl Wheezer
  • Billy as Sheen Estevez (both are dumb)
  • Mindy as Cindy Vortex
  • Mandy as Libby
  • Gladys as Judy Neutron
  • Harold as Hugh Neutron
  • Hoss Delgado as King Goobot V
  • Sperg as Butch Pakovski
  • Jeff the Spider as Goddard
  • Jimmy witnessing the Yokiens' advancements as Itself
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