- Nan Spencer as Sarah Hall-Small
- Rosita Rivas as Cindy Lou Who
- Jay Williams as The Cat in the Hat
- Monte Blanca as Sam-I-Am
- Terry McCracken as Pam-I-Am
- Walter McCracken as Mack the Turtle
- Boris as Norval the Fish
- Rafael as The Lorax
- Arbolado as Mr. Brown
- Maria as The White-Tufted Floozle Bird
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