- Kirby as George
- Tuff as Harold
- Knuckle Joe as Captain Underpants
- King Dedede as Melvin Sneedly
- Escargoon as Professor Poopypants
- Waddle Doo as Dr. Diaper
- Lady Like as Mrs. Ribble
- Sirica as Jessica Gordon
- Rick as Mr. Fyde
- Tiff as Stephanie Yarkoff
- Meta Knight as Mr. Rustworthy
- Pon as Evil George
- Con as Evil Harold
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