- Principal Skinner as The Lorax
- Ned Flanders as Once-ler
- Bart as Young Once-ler
- Homer as Ted
- Agnes Skinner as Ted's Mom
- Marge as Audrey
- Lenny as Pipsqueak
- Edna Krabeppel as Grammy Norma
- Mr. Burns as Mr. O'Hare
- Barney as Fat Bar-ba-loot
- Groundskeeper Willie and Moe as Once-ler's Brothers
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