- Vernon K. Simpson as The Cat in the Hat
- Deborah Greenleaf as Sarah Hall-Small
- Monk Lenigan as Sam-I-Am
- Edgar Stone as Mack the Turtle
- Jimmy Dolan as Dr. Teeth
- Professor Greenleaf as Mr. Brown
- Mrs. Greenleaf as The White-Tufted Floozle Bird
- Schmidt as The Lorax
- Tommy Isbell as Thidwick the Moose
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