This time the history goes back to the viking age. A group of criminals kidnaps a history teacher (a viking expert), forcing him to show them the secret viking grave. Olsenbanden contacts their old teacher which leads them on an adventure where they have to stop the bad guys before they find the grave. In order to solve the mystery, the player have to go through 10 missions. For each successful mission, they will get closer to the finish line. As always, the Olsenbanden jr have both police and villains on their heels.