- Paul Dietrich as The Cat in the Hat
- Heidi Joan Schoonover as Sarah Hall-Small
- Greta Vademann as Cindy Lou Who
- Andrew Erskine as Sam-I-Am
- Jerry DiSalvo as Thidwick the Big-Hearted Moose
- Michael Humphries as Sylvester McMonkey McBean
- Tatjana Baronova as Pam-I-Am
- Mrs. Dietrich as The White-Tufted Floozle Bird
- Mr. Dietrich as Mack the Turtle
- Madame Gorshev as Daisy-Head Mayzie
- Brudenell as Horton the Elephant
- Mrs. DiSalvo as Joan
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