- Pipsqueak as Dexter
- Female Bar-Ba-Loot as Dee Dee
- Ted as Dexter's Dad
- Audrey as Dexter's Mom
- Ted's Mother as Lee Lee
- Grandma Norman as Mee Mee
- Young Once-ler as Tall Dexter
- The Lorax as Mr. Luzinsky
- Mr. O'Hare as Mandark
- and more
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