- David Rice as The Cat in the Hat
- Millie Harris as Cindy Lou Who
- Roland Cox as The Grinch
- Griffin O'Connor as Sam-I-Am
- Mary Rice as The White-Tufted Floozle Bird
- Mark Kobold as Joey
- William Rice as Mack the Turtle
- Sophie as Sarah Hall-Small (cameo)
- Mr. Bowker as King Derwin
- Ellen as Pam-I-Am
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