- Larry Wilson as The Cat in the Hat
- Richard Parker as Mack the Turtle
- Bernie Lomax as Sam-I-Am
- Gwen Saunders as Sarah Hall-Small
- Paulie as Cindy Lou Who
- Tina as Gertrude McFuzz
- Tawny as Daisy-Head Mayzie
- Vito as Horton the Elephant
- Mr. Parker as King Derwin
- Lomax's Secretary as Jane Kangaroo
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