- Paul Bratter as The Cat in the Hat
- Corie Bratter as Sarah Hall-Small
- Victor Velasco as Mack the Turtle
- Ethel Banks as The White-Tufted Floozle Bird
- Harry Pepper as Sam-I-Am
- Harriet as Pam-I-Am
- Restaurant Proprietor as The Lorax
- Delivery Man as King Derwin
- Frank as Cindy Lou Who
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