- Sportacus as The Cat in the Hat
- Stephanie as Sarah Hall-Small
- Ziggy as Sam-I-Am
- Trixie as Pam-I-Am
- Pixel as Norval the Fish
- Stingy as Mr. Brown
- Robbie Rotten as The Grinch
- Mayor Milfred Meanswell as King Derwin
- Bessie Busybody as Joan
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