Bad guys Fritz Fantom and Rudi Ratte are planning to build a huge robot thief with the aid of a sphere that can bring machines to life. But then Karo and Klaro get hold of it while they’re in their father’s workshop, tinkering on a bicycle that has all kinds of tricks up its sleeve. They’re not happy that their widowed father has just fallen in love, but when the bad guys kidnap Emma, Father’s beloved, to exchange her for the magic sphere, it’s just too much. Together with their tricky bicycle Tom Turbo, they start their campaign to liberate Emma.