- Nick Marshall as The Cat in the Hat
- Darcy McGuire as Sarah Hall-Small
- Lola as Cindy Lou Who
- Dan Wanamaker as Norval the Fish
- Gigi as Daisy-Head Mayzie
- Alexandra Marshall as Sally
- Eve as as Pam-I-Am
- Young Nick Marshall as Little Cat A
- Cameron as Sam-I-Am
- Sue Cranston as Jane Kangaroo
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