- Harry Stevenson as The Cat in the Hat
- Bradley Smith as Sam-I-Am
- Diana Croce as Sarah Hall-Small
- David Watson as Mack the Turtle
- Kathryn Smith as Cindy Lou Who
- Chloe Barlow as Pam-I-Am
- Oscar Gamlen as Joey
- Jenny as The White-Tufted Floozle Bird
- Dr. Margit Vekashi as King Derwin
- Esther Stevenson as Daisy-Head Mayzie
- Bat Gamlen as Horton the Elephant
- Mrs. Maggarolian as Joan
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