Hosts Jack Steward and Colton Smith get up close and personal with the massive brown bears of Katmai National Park in Alaska, home to the largest population of brown bears on the planet. The guys watch bears fish for salmon and dig for clams along the Pacific Coast and camp out in the back country surrounded by bears.

Jack and Colton experience the awesome power of Mother Nature in Alaska as they kayak with whales and sea otters through Glacier Bay National Park, witness glaciers crashing into the sea and trek to get up close to a mammoth Glacier.

Going off the beaten path takes on new meaning for Jack and Colton in the "American Alps" in North Cascades National Park in Washington, as they're pushed to the limit and forced to overcome fears in a quest to make the climb of their lives.

Mountain goats, marmots and spotted owls are just a few of the creatures that Jack and Colton meet face to face as they journey through Olympic National Park in Washington. From rainforest to rocky coast to the magnificent mountains, the guys discover why Olympic is really three parks in one.

Jack and Colton trudge through miles upon miles of volcanic ash and forge a treacherous river in search of one of the most powerful volcanoes on earth. Oh, and they are on constant alert for brown bears too.