• Charlie Chan as The Cat in the Hat
  • Yvonne Roland as Sarah Hall-Small
  • Betty Adams as Cindy Lou Who
  • Richard Masters as Mack the Turtle
  • Lee Chan as Sam-I-Am
  • Arthur Hughes as Horton the Elephant
  • Mr. Cartwright as King Derwin
  • Charlie Chan, Jr. as The Lorax
  • Mr. Hopkins as Mr. Brown
  • Honorable Charles Zaraka as Norval the Fish
  • Inspector Strasser as Joey
  • Dr. Burton as Thidwick the Big-Hearted Moose

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