- Ben as The Cat in the Hat
- Barbra Blair as Sarah Hall-Small
- Harry Cooper as Mack the Turtle
- Helen Cooper as Cindy Lou Who
- Tom as Sam-I-Am
- Judy as Pam-I-Am
- Karen Cooper as Daisy-Head Mayzie
- Newcaster as Joey
- Sheriff McClelland as King Derwin
- Johnny Blair as Norval the Fish
- Cemetery Living Dead as The Grinch
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