• Owen as Arthur
  • Audrey (from The Lorax (2012)) as DW
  • Baca Mitchell (from Pitch Perfect) as Kate
  • Barry as Mr. Read
  • Rexy as Mrs. Read
  • Ted (from The Lorax (2012)) as Pal
  • Gray as Buster
  • Claire as Francine
  • Vivian as Muffy
  • Lowery as Brain
  • Simon Masrani as Binky
  • Balto (from Balto) as George
  • Scott as Mr. Ratburn
  • Charlie as Fern
  • Echo as Sue Ellen
  • Zara as Grandma Thora
  • Vic Hoskins as Rattles
  • Mosy The Mosasaurus as Molly

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