• Littlefoot as Jimmy Neutron
  • Chomper as Carl
  • Rhett as Sheen
  • Cera as Cindy
  • Spike as Goddard
  • Ali as Betty Quinlan
  • Tria as Jimmy's Mom
  • Bron as Jimmy's Dad
  • Ruby as Libby
  • Shorty as Nick
  • Sharptooth as Pultra
  • Red Claw as King Goobot
  • Screech/Thud as Ooblar
  • Doc as Ultra Lord
  • Dinosaur kids as Kids
  • Grandma Longneck as Ms. Fowl
  • Grandpa Longneck as Princible

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