- Hush as The Lorax
- Roag as Once-ler
- Willard Hobbes as Young Once-ler
- Ray Breslin as Ted
- Sister (from The Polar Express) as Ted's Mom
- Abigail Ross as Audrey
- Emil Rottmayer as Pipsqueak
- Dr. Emil Kaikev as Mr. O'Hare
- Armando and Tipa (from Rio) as Once-ler's Brothers
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