• Michael Shayne as The Cat in the Hat
  • Myrle Davis as Sarah Hall-Small
  • Linda Conquest Murdock as Cindy Lou Who
  • Lou Venter as Mr. Brown
  • Lt. Breeze as Mack the Turtle
  • Lois Morny as Pam-I-Am
  • Alexander Morny as Sam-I-Am
  • Mrs. Murdock as Daisy-Head Mayzie
  • Leslie Burdock as Norval the Fish
  • George Anson Phillips as Horton the Elephant
  • Mr. Hensch as Thidwick the Big-Hearted Moose
  • The Mailman as King Derwin
  • Elisha Washburn as Joan
  • The Dentist as Sylvester McMonkey McBean
  • Rudolph as The Lorax

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