- Ted Kramer as The Cat in the Hat
- Joanna Kramer as Sarah Hall-Small
- Billy Kramer as Sam-I-Am
- Margaret Phelps as Cindy Lou Who
- Petie Phelps as Pam-I-Am
- Kim Phelps as The White-Tufted Floozle Bird
- John Shaunessy as Horton the Elephant
- Jim O'Connor as Mr. Brown
- Phyllis Bernard as Sarah Hall-Small
- Judge Atkins as King Derwin
- Court Clerk as Joey
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