• Michael Shayne as The Cat in the Hat
  • Joanne La Marr as Sarah Hall-Small
  • Connie Earle as Cindy Lou Who
  • Inspector Pierson as Sam-I-Am
  • Lynne Evans as The White-Tufted Floozle Bird
  • Max Allaron as Mack the Turtle
  • Otto Kahn as Joey
  • Julian Davis as Horton the Elephant
  • Hal Brennon as Sylvester McMonkey McBean
  • David Earle as Mr. Brown
  • Rusty as The Lorax

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