• US Marshal John Kruger as The Cat in the Hat
  • US Marshal Robert DeGuerin as The Grinch
  • Lee Cullen as Sarah Hall-Small
  • WITSEC Chief Arthur Beller as Sam-I-Am
  • Johnny Casteleone as Norval the Fish
  • William Donohue as The Lorax
  • WITSEC Deptuty Monroe as Joey
  • Daniel Harper as Mack the Turtle
  • Tony Two-Toes as Thidwick the Moose
  • Sergei Ivanovich Petrovsky as Mr. Brown
  • Morehart as King Derwin
  • Agent Calderon as Little Cat A
  • Agent Schiff as Mr. Knox
  • Agent Dutton as Fox in Socks
  • J. Scar as Little Cat Fleep
  • Agent Corman as Morton the Elephant Bird
  • Frediano as Horton the Elephant
  • Claire Isaacs as Cindy Lou Who
  • and more

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