Having seen a depressed polar bear in the zoo Grandfather & his dog Roo set off on an expedition to find the last polar bears. After a treacherous journey on HMS Unsinkable they reach Walrus Bay & the fun really starts. Howling wolves & terible snowstorms delay the start of their trek & when theyre on the way their tent is blown away by the fierce winds. They struggle on hungry & cold to the top of Great Bear Ridge where they see the polar bears at last.