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The young inventors Dick and Jenny Brewster, build their own 'Hoverbug' and hope to win the race which has been organised for home-made Hovercraft, but their arch rivals, Charlie and Sydney, bend the rules by enlisting professional help and by employing devious means to sabotage the Hoverbug.
as Jenny Brewster
as Dick Brewster
as Charlie Gutteridge
as Sydney
as Mr. Watts
as Mr. Gutteridge
as Mr. Brewster
as Postman