- John Bernard Books as The Cat in the Hat
- Bond Rogers as Sarah Hall-Small
- Gillom Rogers as Mack the Turtle
- Dr. E.W. Hostetler as Mr. Brown
- Mike Sweeney as Sam-I-Am
- Jack Pulford as Horton the Elephant
- Carson City Marshal Walter J. Thibido as The Lorax
- Hezekiah Beckum as Joey
- Serepta as Cindy Lou Who
- Moses Brown as Thidwick the Moose
- Jay Cobb as King Derwin
- Dan Dobkins as Sylvester McMonkey McBean
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