- Nancy Drew as Sarah Hall-Small
- Corky Veinshtein as The Cat in the Hat
- Ned Nickerson as Sam-I-Am
- Jane Brighton as Cindy Lou Who
- Carson Drew as Young Cat in the Hat
- John Leshing as The Lorax
- Dehlia Draycott as Pam-I-Am
- Dashiel Zachary Biedermeyer as Little Cat A
- Inga Veinshtein as Jane Kangaroo
- Trish as The White-Tufted Floozle Bird
- and more
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