Zoologist Nigel Marven explores the wildlife of the Canadian Arctic. It is springtime and Nigel starts his nine-month quest to explore the realm of the polar bear. He takes a dogsled ride from Churchill to see Arctic foxes and caribou; braves temperatures of -30 degrees to witness the jaw-dropping majesty of the Northern Lights at Wapusk National Park; and follows a polar bear mother and two cubs across the tundra.