- Michael Shayne as The Cat in the Hat
- Catherine Wolff as Sarah Hall-Small
- Anna Wolff as Cindy Lou Who
- Dr. Haggard as King Derwin
- Roger Blake as Mack the Turtle
- Dudley Wolff as Sam-I-Am
- Phillips as Joey
- Chief of Police Jonathan Meek as Sylvester McMonkey McBean
- Alfred Dunning as Horton the Elephant
- Zorah Bey as The Lorax
- Coroner Tim Larsen as Mr. Brown
- Caretaker as Norval the Fish
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