- Dawn O'Keffe as Sarah Hall-Small
- Brad as The Cat in the Hat
- Dr. Godfrey as King Derwin
- Tobey as The Grinch
- Bill as Sam-I-Am
- Kim as Cindy Lou Who
- Ryan as Mack the Turtle
- Alisha as Pam-I-Am
- Phil as Joey
- Mr. Vincent as Horton the Elephant
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