- Oliver Rose as The Cat in the Hat
- Barbara Rose as Daisy-Head Mayzie
- Gavin D'Amato as Thing One
- Susan as Cindy Lou Who
- Gavin's client as Norval the Fish
- 17-year-old Josh Rose as Joey
- 10-year-old Josh Rose as Sam-I-Am
- 17-year-old Carolyn Rose as Sarah-Hall Small
- Harry Thurmont as Thing Two
- Jason Larrabee as Birthday Bird
- Dr. Gordon as The Grinch
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