- Homer Simpson as Rex
- Ned Flanders as Woog
- Bart Simpson as Dweeb
- Marge Simpson as Elsa
- Milhouse as Louie
- Lisa Simpson as Cecilia
- Grandpa Abe as Captain Neweyes
- Krusty as Stubbs
- Mr. Burns as Professor Screweyes
- Maude Flanders as Dr. Bleeb
- Young Simba (from The Lion King) as Buster
- Adult Nala (from The Lion King) as Buster's Mother
- Mufasa (from The Lion King) as Buster's Father
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