The four kids, Julian, Dick, Georgina and Anne plus the dog Tim go on a bike-trip without any grownups around, but they are soon followed by a another boy, Richard, who is pursued by kidnappers.
| Actor | Role |
|---|---|
 Ove SprogøeOnkel Quentin | Onkel Quentin |
 Lily BrobergKokkepigen Johanne | Kokkepigen Johanne |
 Astrid VillaumeTante Fanny | Tante Fanny |
| KKristian PaaschburgRichard Kent | Richard Kent |
| MManfred ReddemannPerton | Perton |
| HHubert MittendorfMax | Max |
| FFrank NossakRooky | Rooky |
| JJørn Walsøe TherkelsenWeston | Weston |
| MMarie BrinkAggie | Aggie |
 Børge HilbertKaufmann | Kaufmann |
| RRuth MaisieDame beim Einkaufen | Dame beim Einkaufen |
| MMax GårdstedPolizeibeamter | Polizeibeamter |
| RRagnhild JørgensenRichards Mutter | Richards Mutter |
| PPoul RahbekRichards Vater | Richards Vater |
| WWilly FlinkTankstellenwart | Tankstellenwart |
| CChristian HansenPolitiassistent | Politiassistent |