• Gene Cordell as The Cat in the Hat
  • Alec Stiles as Sam-I-Am
  • FBI Inspt. George A. Briggs as Mack the Turtle
  • Judy Stiles as Sarah Hall-Small
  • Police Chief Bernard Harmatz as Joey
  • Shivy as Horton the Elephant
  • Matty as The Lorax
  • Cy Gordon as Mr. Brown
  • Commissioner Demory as Norval the Fish

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