- Heathcliff as The Cat in the Hat
- Wordsworth as Mack the Turtle
- Hector as Joey
- Grandpa as Horton the Elephant
- Leroy as Mr. Brown
- Spike as Sam-I-Am
- Mungo as Norval the Fish
- Cleo as Sarah Hall-Small
- Sonja as Cindy Lou Who
- Riff-Raff as The Grinch
- and more
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