• Harry Hayes as The Cat in the Hat
  • Scott Reynolds as Sam-I-Am
  • Pavel Vendek as Mack the Turtle
  • Jim Harcourt as Norval the Fish
  • Christine as Joan
  • Bill Oliver as King Derwin
  • Sunny Pintubi as Thidwick the Big-Hearted Moose
  • Commentator as Joey
  • Kaverley as The Lorax
  • Richie Robinson as Nick
  • Mrs. Hayes as Jane Kangaroo
  • Gilmour as Yertle the Turtle
  • Mae Harcourt as The White-Tufted Floozle Bird
  • Cal Wood as Little Cat Y

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