Alone in Alaska's Katmai National Park, the Kratts come face-to-face with the mighty brown bear. Contrasting his diet and strength with that of the largest carnivore in North America, Chris eats sedge and digs clams in the wet, cold sand. But the brothers never let their guard down. Just feet behind them, two bears brawl over territory and in front, a mother uses the brothers as a shield to protect her cub against a stalking male bear. This extreme proximity provides the opportunity for the Kratts to offer a truly up-close perspective on this peaceful creature harboring explosive power.