- 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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