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.
Jill Riddick
as Jenny Brewster
John Trayhorn
as Dick Brewster
Francis Attard
as Charlie Gutteridge
Gary Cann
as Sydney
Arthur Howard
as Mr. Watts
Michael Balfour
as Mr. Gutteridge
Peter Myers
as Mr. Brewster
Cardew Robinson
as Postman
