• Frederick Henry as The Cat in the Hat
  • Catherine Barkley as Cindy Lou Who
  • Major Alessandro Rinaldi as Sam-I-Am
  • Dr. Emerich as The Lorax
  • Miss Van Campen as Sarah Hall-Small
  • Helen Ferguson as Pam-I-Am
  • Bonello as Mr. Knox
  • Colonel Valentini as Horton the Elephant
  • Aymo as Little Cat A
  • Passini as Fox in Socks
  • Major Stampi (as Jose Nieto) as Sylvester McMonkey McBean
  • Captain Bassi (as Georges Brehat) as Joey
  • Mrs. Zimmerman as The White-Tufted Floozle Bird
  • Lieutenant Zimmerman as King Derwin

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