- Lane Bellamy as Sarah Hall-Small
- Fielding Carlisle as The Cat in the Hat
- Sheriff Titus Semple as Joey
- Lute Mae Sanders as Cindy Lou Who
- Dan Reynolds as Sam-I-Am
- Annabelle Weldon as Pam-I-Am
- Dr. Waterson as King Derwin
- Millie as The White-Tufted Floozle Bird
- Pete Ladas as The Lorax
- Gracie as Daisy-Head Mayzie
- Boatright as Norval the Fish
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