• Tom Rath as The Cat in the Hat
  • Betsy Rath as Cindy Lou Who
  • Ralph Hopkins as Mack the Turtle
  • Maria Montagne as Gertrude McFuzz
  • Judge Bernstein as King Derwin
  • Helen Hopkins as Sarah Hall-Small
  • Sgt. Caesar Gardella as Horton the Elephant
  • Bill Hawthorne as Thidwick the Big-Hearted Moose
  • Susan Hopkins as Jane Kangaroo
  • Janey Rath as Daisy-Head Mayzie
  • Gordon Walker as Morton the Elephant Bird
  • Bill Ogden as The Grinch

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