- Lily Mars as Sarah Hall-Small
- John Thornway as The Cat in the Hat
- Mrs. Thornway as Daisy-Head Mayzie
- Owen Vail as Sam-I-Am
- Mrs. Mars as Cindy Lou Who
- Isobel Rekay as Pam-I-Am
- Frankie as Mr. Brown
- Leo as The Lorax
- Violet as The White-Tufted Floozle Bird
- Rosie as Annie DeLoo
- Davey as Joey
- Charlie Porter as King Derwin
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