- Frank Morris as The Cat in the Hat
- Clarence Anglin as Sam-I-Am
- John Anglin as The Lorax
- Charley Butts as Mr. Brown
- Warden Paul J. Madigan as King Derwin
- English as Joey
- Litmus as Mack the Turtle
- Chester "Doc" Balton as Sylvester McMonkey McBean
- Wolf Grace as Horton the Elephant
- Inmate as Thidwick the Big-Hearted Moose
- Beck as Norval the Fish
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