• Spencer as The Lorax
  • Hiro as The Once-ler
  • Diesel as Young Once-ler
  • Toby as Ted
  • Emily as Ted's Mom
  • Mavis as Audrey
  • Billy as Pipsqueak
  • Daisy as Grammy Norma
  • James as Mr. O'Hare
  • Hank as Fat Bar-ba-loot
  • Donald and Douglas as The Once-ler's Brothers

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