- Sean Casey as The Cat in the Hat
- Liam Casey as Sam-I-Am
- Joey Allgretto as King Derwin
- Peggy Lindstrom as Pam-I-Am
- Sam Vigoda as Zizzer-Zazzer-Zuzz
- Jordan Washington as Vlad Vladikoff
- Morgenstern as Little Cat B
- Elihu Harrison as Thidwick the Big-Hearted Moose
- Judge Dominick Impelliteri as The Lorax
- McGovern as Norval the Fish
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