• 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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