• Jimmy Neutron as Olie
  • Betty Quinlan as Zowie
  • Goddard as Spot
  • Judy Neutron as Polina
  • Hugh Neutron as Percy
  • Newt Neutron as Gizmo
  • Granny Neutron as Pappy (both old; genderbent role)
  • Cindy Vortex as Polie Pi
  • Carl Wheezer as Billy
  • Nick Dean as Binky
  • Martha Wheezer as Bonita
  • Ebenezer Wheezer as Baxter
  • Sheen Estevez as Screwy
  • Bolbi Stroganovsky as Wheely
  • Professor Calamitous as Gloomius Maximus
  • Mrs. Fowl as Ms. Ehtel

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