- Alice Marano as Sarah Hall-Small
- Darlene Davis as Cindy Lou Who
- Henry Greene as The Cat in the Hat
- Roy Knox as Sam-I-Am
- Yon Greene as Pam-I-Am
- Nick Parks as Mack the Turtle
- Doug Davis as Horton the Elephant
- Beth Ann Gardener as The White-Tufted Floozle Bird
- Bill Marano as Norval the Fish
- Chief Detective Jagkrit as Joey
- Jason as The Lorax
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