• Hud Brannon as The Cat in the Hat
  • Homer Bannon as Mack the Turtle
  • Lonnie Bannon as Sam-I-Am
  • Alma Brown as Sarah Hall-Small
  • Mr. Burris as Mr. Brown
  • Jesse as Horton the Elephant
  • Hermy as Sylvester McMonkey McBean
  • Jose as Thidwick the Big-Hearted Moose
  • Joe Scanlon as Joey
  • Truman Peters as The Lorax
  • Mr. Thompson as Conrad
  • Mr. Larker as Norval the Fish
  • Radio Announcer Frank as King Derwin
  • Charlie Tucker as Zizzer-Zazzer-Zuzz
  • Myra as Cindy Lou Who
  • Lily Peters as Pam-I-Am

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