Two dolls, Hugo & Henriëtte, grow to human size after eating sweets from a magic box they find in the toy store. And go out on an adventure. The store keeper asks the police to find them and bring them back.
Hugo & Henriette learn the rules of traffic. Meanwhile the storekeeper is very concerned about his two favorite dolls. Zwarte Piet comes round with a large list of toys needed by Sint Nicholaas.