- The Cat in the Hat as Michael Shayne
- Sarah Hall-Small as Catherine Wolff
- Cindy Lou Who as Anna Wolff
- King Derwin as Dr. Haggard
- Mack the Turtle as Roger Blake
- Sam-I-Am as Dudley Wolff
- Joey as Phillips
- Sylvester McMonkey McBean as Chief of Police Jonathan Meek
- Horton the Elephant as Alfred Dunning
- The Lorax as Zorah Bey
- Mr. Brown as Coroner Tim Larsen
- Norval the Fish as Caretaker
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