S2, E3: Remote and wild, the Yukon is a river of extremes; in summer a restless giant, in winter, a river of ice. Home to grizzlies, moose and great runs of salmon, the Yukon lies at the heart of a vast northern wilderness. From indigenous hunters to gold-prospectors, musk ox to caribou, the Yukon’s natural riches have long sustained people and animals and continue to do so despite its changing fortunes.