• Tom as Horton
  • Kevin as The Mayor of Who-ville
  • Lucy Wilde (from Despicable Me 2) as Mrs. Quillingan
  • Pipsqueak (from Dr. Seuss' The Lorax) as Morton
  • Jorge as Katie
  • Mark as Sally
  • Scarlet as Kangaa
  • Herb as Vlad
  • Audrey (from Dr. Seuss' The Lorax) as Helen
  • Stuart as Jojo

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