- The Cat in the Hat as Basil
- Horton the Elephant as Dawson
- Cindy Lou Who as Olivia Flaversham
- Sam-I-Am as Hiram Flaversham
- Vlad Viadikoff as Fidget
- The Grinch as Ratigan
- Wickershams as Ratigan's Henchmen
- Daisy-Head Mayzie as The Robot Queen
- Sarah Hall-Small as The Singing Female Mouse
- Pam-I-Am as The Queen Mouse
- Yertle the Turtle as Bill the Lizard
- Morton the Elephant Bird as Toby
- Jane Kangaroo as Felicia the Kangaroo
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