- 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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