Grandfather is off on an expedition to the North Pole to find the Last Polar Bears. Accompanying him is Roo, a remarkable little dog with strong views and a short attention span, and a golf cart full of equipment. The intrepid explorers set sail on the good ship Unsinkable and embark on the adventure of a lifetime. Grandfather and Roo endure storms, high seas, a temperamental sea captain, and seasickness until the ship reaches Walrus Bay. In the primitive coastal town of Walrus, Grandfather gets in a game of golf but unscrupulous wolves plague him and Roo. Finally, Grandfather and Roo and a penguin companion head off on foot to find the Great Bear Ridge, home to the Last Polar Bears.