- Steve Sherman as The Cat in the Hat
- Samantha (Sam) Blake/Mimi as Sarah Hall-Small
- Leena as Cindy Lou Who
- Felicienne Courbeau as Pam-I-Am
- Joseph Bergner as Sam-I-Am
- Harry Gorman as Mack the Turtle
- Maurice Chevalier as Horton the Elephant
- Bertram Chalmers as Norval the Fish
- Mrs. Chalmers as The White-Tufted Floozle Bird
- Stewardess as Daisy-Head Mayzie
- Frenchman at Restaurant as The Lorax
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