- Cat as The Cat in the Hat
- Dog as Sam-I-Am
- Mr. DuBois as Mack the Turtle
- Mean Bob as Joey
- Randolph Grant as Norval the Fish
- Winslow as Mr. Brown
- Winslow's Niece and Nephew as Thing One and Thing Two
- CatDog's Mom as Sarah Hall-Small
- Tallulah as The White-Tufted Floozle Bird
- Lube as Terrence McBird
- Cliff as The Grinch
- Mrs. DuBois as Jane Kangaroo
- Shriek as Cindy Lou Who
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