• Vernon K. Simpson as The Cat in the Hat
  • Deborah Greenleaf as Sarah Hall-Small
  • Monk Lenigan as Sam-I-Am
  • Edgar Stone as Mack the Turtle
  • Jimmy Dolan as Dr. Teeth
  • Professor Greenleaf as Mr. Brown
  • Mrs. Greenleaf as The White-Tufted Floozle Bird
  • Schmidt as The Lorax
  • Tommy Isbell as Thidwick the Moose

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