• Bill Chandler as The Cat in the Hat
  • Connie Allenbury as Sarah Hall-Small
  • Gladys Benton as Cindy Lou Who
  • Warren Haggerty as Sam-I-Am
  • J.B. Allenbury as Mack the Turtle
  • Spike Dolan as Horton the Elephant
  • Curtis Farwood as The Lorax
  • Hector Boswell as Mr. Brown
  • Joe as Joey
  • Mary as The White-Tufted Floozle Bird
  • Barbara Norvell as Pam-I-Am
  • Homer Henshaw as King Derwin
  • Mrs. Burns Norvell as Daisy-Head Mayzie

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