- Alex Cross as The Cat in the Hat
- Jezzie Flannigan as Sarah Hall-Small
- Gary Soneji/The Spider as The Grinch
- Ollie McArthur as Sam-I-Am
- Megan Rose as Cindy Lou Who
- Ben Devin as Nick
- Dimitri Starodubov as Mack the Turtle
- Kyle Craig as Joey
- Senator Hank Rose as Vlad Vladikoff
- Vickie as Pam-I-Am
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