- Gene Cordell as The Cat in the Hat
- Alec Stiles as Sam-I-Am
- FBI Inspt. George A. Briggs as Mack the Turtle
- Judy Stiles as Sarah Hall-Small
- Police Chief Bernard Harmatz as Joey
- Shivy as Horton the Elephant
- Matty as The Lorax
- Cy Gordon as Mr. Brown
- Commissioner Demory as Norval the Fish
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