Inventor Black is warmly invited to exhibit his latest invention, the Skimmer, at the prestigious Modern Times exhibition in Chisleton, so, Supergran takes it for a test run. Once The Scunner Campbell gets wind of the new all purpose vehicle, he steals it and presents it to his former cell-mate Roly Roofless. Together they plan to use it as the ultimate getaway vehicle in a silver bouillon caper.