- Matthias Lee Whitlock as The Cat in the Hat
- Alex Diaz-Whitlock as Sarah Hall-Small
- Anne-Merai Harrison as Cindy Lou Who
- Chris Harrison as Sam-I-Am
- Chae as Mack the Turtle
- Tony Dalton as Norval the Fish
- Paul Cabot as Joey
- Deputy Baste as Horton the Elephant
- Agent Stark as Sylvester McMonkey McBean
- Dr. Donovan as Pam-I-Am
- Dr. Frieland as Mr. Brown
- Detective Bronze as Thidwick the Moose
- Robert Guillette as Conrad
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