• Paul Dietrich as The Cat in the Hat
  • Heidi Joan Schoonover as Sarah Hall-Small
  • Greta Vademann as Cindy Lou Who
  • Andrew Erskine as Sam-I-Am
  • Jerry DiSalvo as Thidwick the Big-Hearted Moose
  • Michael Humphries as Sylvester McMonkey McBean
  • Tatjana Baronova as Pam-I-Am
  • Mrs. Dietrich as The White-Tufted Floozle Bird
  • Mr. Dietrich as Mack the Turtle
  • Madame Gorshev as Daisy-Head Mayzie
  • Brudenell as Horton the Elephant
  • Mrs. DiSalvo as Joan

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