- Bernie the Gorilla as The Lorax
- Rodney the Koala as The Once-ler
- Elmo the Ostrich as Young Once-ler
- Griffin as Ted Wiggins
- Mollie the Giraffe as Audrey
- Janet the Lioness as Ted's Mom
- Sebastian the Wolf as Mr. O' Hare
- Ray the Koala as Pipsqueak
- Jerome and Bruce The Grizzly Bears as The Once-Ler's Brothers
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