• Dr. Zoidberg as The Lorax
  • Professor Farnsworth as The Once-ler
  • Scruffy as Young Once-ler
  • Nibbler as Pipsueak
  • Fry as Ted Wiggins
  • Leela as Audrey
  • Amy as Ted's Mom
  • Inez Wong as Grandma Norma
  • Wernstrom as Mr. O' Hare
  • Kyle (from South Park) as Fat Bar-ba-loot
  • Chris and Brian (from Family Guy) as The Once-Ler's Brothers

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