• P.J. McNeal as The Cat in the Hat
  • Frank Wiecek as Sam-I-Am
  • Brian Kelly as Mack the Turtle
  • Wanda Skutnik as Sarah Hall-Small
  • Tillie Wiecek as The White-Tufted Floozle Bird
  • Helen Wiecek as Cindy Lou Who
  • K.L. Palmer as The Lorax
  • Pardon Board Chairman as Joey
  • Sullivan as Horton the Elephant
  • Sam Faxon as Norval the Fish
  • Martin J. Burns as Thidwick the Big-Hearted Moose
  • Tomek Zaleska as Mr. Brown
  • Frank Wiecek Jr. as Sylvester McMonkey McBean
  • Rayska as Little Cat B
  • Corrigan as Little Cat A
  • Receptionist as Daisy-Head Mayzie
  • Narrator as King Derwin

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