- Mr. Jefferson as The Lorax
- Peter Griffin (from Family Guy) as Once-ler
- Rodrick Heffley as Young Once-ler
- Greg Heffley as Ted
- Ashley (from Alvin and the Chipmunks: The Road Chip) as Ted's Mom
- Holly Hills as Audrey
- Rowley Jefferson as Pipsqueak
- Mr. Gerabit as Mr. O'Hare
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