• 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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