- 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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