- Irwin as Jimmy Neutron
- Stan Marsh (From South Park) 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
- Grim as King Goobat V
- The Wasp#1 (From Maya the Bee) as Ooblar
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