- Keswick as Dexter (Keswick and Dexter are both smart, intelligent and clever)
- Biff as Tall Dexter
- Dudley Puppy as Dexter's Dad
- Kitty Katswell as Dexter's Mom
- The Chipmunk Girl as Dee Dee
- Zippy as Mee Mee
- The Chief as Mr. Luzinsky
- Bird Brain as Mandark
- The Chameleon as Mandark's Duck
- Francisco as Gary
- Larry as Jeff
- Verminious Snaptrap as Mandark's Dad
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