- Jim Hawkins as The Cat in the Hat
- Ben as Sam-I-Am
- Morph as Goober
- Dr. Delbert Doppler as Norval the Fish
- Captain Amelia as Sarah Hall-Small
- Narrator as King Derwin
- John Silver as Horton the Elephant
- Mr. Arrow as Joey
- Sarah Hawkins as The White-Tufted Floozle Bird
- Onus as The Grinch
- Scroop as Vlad Vladikoff
- Young Jim as Little Cat A
- Police Officers as Mr. Knox and Fox in Socks
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