- John Longridge as Arthur
- Professor James Hunter as Binky
- Nancy Hunter as D.W.
- Elizabeth Hunter as Muffy
- Peter Hunter as Brain
- The Hermit as Buster
- James MacKenzie as George
- Nell MacKenzie as Kate
- Mrs. Oakes as Francine
- Bert Oakes as Mr. Haney
- Bodger as David
- Luath and Tao as Tibble Twins
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