- Professor Ned Brainard as The Cat in the Hat
- Betsy Carlisle as Sarah Hall-Small
- Alonzo P. Hawk as The Grinch
- Biff Hawk as Joey
- President Rufus Daggett as King Derwin
- Professor Shelby Ashton as Sam-I-Am
- Defense Secretary as Alvin the Alien
- General Singer as The Lorax
- Air Force Captain as Norval the Fish
- Mrs. Chatsworth as Cindy Lou Who
- Coach Elkins as Nick
- Reverend Bosworth as Sylvester McMonkey McBean
- Fire Chief as Thidwick the Moose
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