Some sort of undead viking woke up from a long slumber. Like it's common for its people, the first thing he started to do was to conquer territory. Since he is almost a ghost, there is no need for food or anything similar, so he is even more focused on his only true goal of conquering the world. He has transformed these isles that belong to his descendants into frozen islands. The only way to stop him is to, with the Mouse, send troops of vikings of the new era in their boats and then attack the people he turned into zombies.