• Harry Stevenson as The Cat in the Hat
  • Bradley Smith as Sam-I-Am
  • Diana Croce as Sarah Hall-Small
  • David Watson as Mack the Turtle
  • Kathryn Smith as Cindy Lou Who
  • Chloe Barlow as Pam-I-Am
  • Oscar Gamlen as Joey
  • Jenny as The White-Tufted Floozle Bird
  • Dr. Margit Vekashi as King Derwin
  • Esther Stevenson as Daisy-Head Mayzie
  • Bat Gamlen as Horton the Elephant
  • Mrs. Maggarolian as Joan

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