- Sgt. John Berlin as The Cat in the Hat
- Helena Robertson as Cindy Lou Who
- Special Agent St. Anne as Sam-I-Am
- Sgt. Freddy Ross as Norval the Fish
- Margie Ross as Sally
- Sgt. John "J.K." Taylor as The Lorax
- Chief Citrine as Mack the Turtle
- Travis as King Derwin
- Bobby as Conrad
- Bisley as Mr. Brown
- Max as Horton the Elephant
- Trimble as Birthday Bird
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