• Frank Morris as The Cat in the Hat
  • Clarence Anglin as Sam-I-Am
  • John Anglin as The Lorax
  • Charley Butts as Mr. Brown
  • Warden Paul J. Madigan as King Derwin
  • English as Joey
  • Litmus as Mack the Turtle
  • Chester "Doc" Balton as Sylvester McMonkey McBean
  • Wolf Grace as Horton the Elephant
  • Inmate as Thidwick the Big-Hearted Moose
  • Beck as Norval the Fish

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