• Father Chuck O'Malley as The Cat in the Hat
  • Sister Mary Benedict as Sarah Hall-Small
  • Horace P. Bogardus as The Lorax
  • Joe Gallagher as Mr. Brown
  • Sister Michael as Cindy Lou Who
  • Patricia "Patsy" Gallagher as Joan
  • Mary Gallagher as Pam-I-Am
  • Dr. McKay as Joey
  • Eddie Breen as King Derwin

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