- Billy "Wormboy" Forrester as Arnold
- Erika "Erk" Tansy as Helga
- Joe Guire as Scheck
- Adam as Grandpa Phil
- Twitch as Ernie
- Benjy as Gerald
- Bradley as Arnie
- Uncle Ed as Harold
- Woody Forrester as Dino Spumoni
- Principal "Boilerhead" Burdock as Mr. Simmons
- Mitch Forrester as Coach Wittenberg
- Helen Forrester as Oskar
- and more
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