Follows the bears of Alaska's Katmai National Park as they bulk up for winter hibernation. Over 150 days, the bears battle the elements – and each other – using brains and brawn to consume three million calories and gain up to 200 pounds in Nature’s real-life survival show.

Cast:Rhys Darby,

Genre:Documentary,

country:Canada, United States of America,

Production:Love Nature, AMPLE Entertainment,