- The Lorax as Cookie Monster
- The Once-Ler as Grover
- Ted as Elmo
- Ted's Mom as Rosita
- Audrey as Zoe
- Pipsqueak as Baby Bear (Both are Bears)
- Aunt Grazelda as Lulu
- Mr. O'Hare as Oscar the Grouch
- Fat Bar-Ba-Loot as Telly Monster
- Brett & Chet as Bert and Ernie
- The Once-Ler's Mother as Maria
- Grammy Norma as Gina
- Ubb as Count Von Count
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