A slightly crazy professor ‘Historyjek’ asks Simon (Szymon) and Agatha (Agata) to help him repair… the history of Poland! The easy-going scientist has created a super computer which enables time travels. The machine was to be used in the future as an educational tool teleporting students to specific events in Polish history. Unfortunately, the system overload caused the computer to erase most of the data collected during the professor’s pioneering expeditions into the past and swallowed lots of items from different historical events, which should be returned to their places as soon as possible. In those episodes, Simon and Agatha are not only the witnesses of various, interesting events, such as the Baptism of Poland or battles waged by the Polish kings, but they also meet many historical figures like Mieszko I and his family – Bolesław the Brave, Bolesław Krzywousty, his brother Zbigniew and many others.