• Duke as Casper
  • Chloe as Amelia Harvey
  • The Once-ler's Mom (from Dr. Seuss' The Lorax) as Amber Whitmire
  • Max as Dr. James Harvey
  • Mel as Vic DePhillippi
  • Vector (from Despicable Me) as Dibs
  • Dr. Nefario (from Despicable Me) as Stinkie
  • Mr. O'Hare (from Dr. Seuss' The Lorax) as Fatso

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