- George Hartman as The Cat in the Hat
- Edith Martin as Sarah Hall-Small
- Audrey Martin as Cindy Lou Who
- Conrad Hartman as Sam-I-Am
- Boneyard Sims as Mack the Turtle
- Roland Emerson as Joey
- Justin as Horton the Elephant
- Daphne as Norval the Fish
- Travis as The Lorax
- Professor Riley as King Derwin
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