- Raymond Babbitt as The Cat in the Hat
- Charles Babbitt as Sam-I-Am
- Susanna as Sarah Hall-Small
- Dr. Bruner as Mack the Turtle
- Lenny as The Lorax
- Vern as Mr. Brown
- Sally Dibbs as Pam-I-Am
- Mother at Farm House as The White-Tufted Floozle Bird
- Iris as CIndy Lou Who
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