- Milo Thatch as The Cat in the Hat
- Princess Kida as Sarah Hall-Small
- Dr. Sweet as Joey
- Mole as Sam-I-Am
- Vinny as Norval the Fish
- Preston Whitmore as Mack the Turtle
- Cookie as Mr. Brown
- Wihelmina Packard as Aunt Myrtle
- Helga Sinclair as Jane Kangaroo
- Lyle T. Rourke as The Grinch
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