• Elizabeth Blair as Cindy Lou Who
  • Edward Morgan as The Cat in the Hat
  • Mary Blair as Sarah Hall-Small
  • Genevieve Graham as Pam-I-Am
  • Reynolds as King Derwin
  • Mrs. Henrietta Denham as The White-Tufted Floozle Bird
  • Mrs. Higgins as Joan
  • James Wyckoff as The Lorax
  • Jimmie Rogers as Mack the Turtle

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