- Professor Ned Brainard as The Cat in the Hat
- Betsy Carlisle as Daisy-Head Mayzie
- Alonzo P. Hawk as Norval the Fish
- A. J. Allen as Mr. Knox
- Mr. Harker as Joey
- TV announcer Rex Williams as Yertle the Turtle (uncredited)
- Biff Hawk as The Grinch
- Baby Walter as Cindy Lou Who (voice)
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