- Oskar Shcell as The Cat in the Hat
- Thomas Schell, Sr./The Renter as King Derwin
- Linda Schell as Sarah Hall-Small
- Abby Black as Sally
- Thomas Schell as Sam-I-Am
- Stan the Doorman as Norval the Fish
- William Black as Thidwick the Big-Hearted Moose
- Oskar's Grandmother as Cindy Lou Who
- Hazzelle Black as Gertrude McFuzz
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