- Tim Lockwood as The Lorax
- Chicken Joe (from Surf's Up) as The Once-ler
- Tall Dexter (from Dexter's Laboratory) as Young Once-ler
- Steve the Monkey as Pipsqueak
- Flint Lockwood as Ted
- Samantha "Sam" Sparks as Audrey
- Helen (from Horton Hears a Who) as Ted's Mom
- The Giant of Nod (from Dragon Tales) as Mr. O'Hare
- Armando and Tipa (from Rio) as The Once-ler's Brothers
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