- Benjamin "Ben" Fiedler as The Cat in the Hat
- Joanne Fiedler as Cindy Lou Who
- Adam Fiedler as King Derwin
- Arnie Stein as Sam-I-Am
- Raylene Stein as Sarah Hall-Small
- Zachary "Zach" Stein as Joey
- Karen Sussman as Pam-I-Am
- Ashley Grunwald as Jane Kangaroo
- Casey Nudelman as The White-Tufted Floozle Bird
- Irwin Fiedler as Little Cat A
- Sandy Frost / Sacred Father as Joan
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