- Bobby Mercer as The Cat in the Hat
- Angel Mercer as Sam-I-Am
- Jeremiah Mercer as Mack the Turtle
- Jack Mercer as Norval the Fish
- Lt. Green as Morton the Elephant Bird
- Detective Fowler as Little Cat B
- Victor Sweet as Thidwick the Big-Hearted Moose
- Camille Mercer as Cindy Lou Who
- Sofi as Pam-I-Am
- Evelyn Mercer as Joan
- Robert Bradford as Little Cat A
- Evan as The Grinch
- Darnell as Little Cat C
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