Two primary schools participate in a Medieval game, two children disappear in the event. His friends look for them and instead of finding them they give with a strange stone that possesses properties for the teleportation.They build a time machine with it, travel to the Middle Ages and find their missing friends. After several incidents with medieval children manage to rebuild the time machine and finally return to the present.

Ce synopsis est en anglais : nous ne l'avons pas encore traduit.