- Sheen Estevez as Alvin
- Jimmy Neutron as Simon
- Carl Wheezer as Theodore
- Libby Folfax as Brittany
- Cindy Vortex as Jeanette
- Brittany Tenelli as Eleanor
- Hugh Neutron as Dave Seville
- Granny Neutron as Miss Miller
- Judy Neutron as Vinny/Claire Wilson
- Professor Calamitous as Uncle Harry/Ian Hawke
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