- Stanley "Sparks" Garrett as The Cat in the Hat
- Alice MacKenzie as Daisy-Head Mayzie
- Constance "Connie" Porter as Cindy Lou Who
- Gus Smith as Horton the Elephant
- WIlli as Joey
- John Kavac as Sam-I-Am
- Charles J. "Ritt" Rittenhouse as Norval the Fish
- Mrs. Higgens as Sarah-Hall Small
- Joe "George" Spencer as Thing One
- German Sailor as Thing Two
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