• Linus Larrabee as Arthur
  • Sabrina Fairchild as D.W.
  • David Larrabee as Buster
  • Thomas Fairchild as Binky
  • Oliver Larrabee as Mr. Ratburn
  • Maude Larrabee as Muffy
  • Elizabeth Tyson as Francine
  • Baron St. Fontanel as Brain
  • The Professor as Dad
  • Miss McCardle as Kate
  • Mr. Tyson as George
  • Gretchen Van Horn as Sue Ellen
  • Nancy Kulp as Prunella (uncredited)

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