• Henry as Arlo
  • Ivor as Spot
  • Daddo as Poppa Henry
  • Momma as Momma Ida
  • Cobby as Buck
  • Summer as Libby
  • Oscar as Butch
  • Denzel as Nash
  • Meg as Ramsey
  • Fergus as Forrrest Woodbush
  • Roddy as Thunderclap
  • Monsterrobots as The Pterodactyls
  • Mini-Monsters as The Velociraptors
  • Monstertroll as Tetrapodophis
  • Roberto Gertie Milo and Izzy as Cave Family

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