- Alan Spender as The Cat in the Hat
- Victoria Kowelska as Pam-I-Am
- Major Marc Bennett as King Derwin
- Margaret as Sarah Hall-Small
- Christopher as Norval the Fish
- Dr. Burkhardt as Zizzer-Zazzer-Zuzz
- Joseph C. Callahan as Sam-I-Am
- Kei as Little Cat B
- Mr. Whitmore as The Grinch
- Mrs. Whitmore as Cindy Lou Who
- Tony as Joey
- Man at Accident as Vlad Vladikoff
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