On voyage high north, Halvar's drakkar moors accidentally on a piece of icy coast that breaks and drifts off. Worse, caught on it with them is a polar bear, who decides a diet of Vikings is his only option. Outrunning him is very hard, even long enough for everyone in turn to get aboard. When the final can sail off, the bear catches up and terrorizes the ship. Vic must steer it back from the mast, where everybody hides.