- Phillip Hannon as The Cat in the Hat
- Jean Lennox as Sarah Hall-Small
- Bob Matthews as Mack the Turtle
- Inspector Grovening as Sam-I-Am
- Lady Syrett as Pam-I-Am
- Barmaid as Cindy Lou Who
- Mr. Murch as King Derwin
- Pillings as The Lorax
- Janet Murch as The White-Tufted Floozle Bird
- Sergeant Luce as Joey
- Miss Alice MacDonald as Daisy-Head Mayzie
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