In the final episode of this brand new series, Gordon Buchanan, Kate Humble and Simon Reeve continue to explore the planet's last great wilderness - the Arctic.Broadcasting live from the shores of Canada's Hudson Bay at the peak of polar bear season, the team discover what life is really like on top of the world, and ask what the future could hold for this incredible part of our planet.Tonight Kate meets the Inuit artists inspired by the changing world around them, while Simon heads off to Norway on a fishing expedition - Arctic style - as well as venturing deep into the heart of Siberia to track Russia's history, from Gulags to gas.In Churchill, Gordon finds out how the town deals with their more troublesome bears when he follows the eviction of a repeat offender. Plus, live from Hudson Bay, the team check on the bears. How long before they can head out to hunt? What happens if the ice continues to melt? And what wider implications does this have for us all?