Jack and Colton come face to face with massive brown bears in Alaska's Katmai National Park, and watch as they fish and dig for clams.

The adventure through Alaska continues; this time Jack and Colton visit Glacier Bay National Park, where they take their chances with open sea kayaks, encountering incredible glaciers and wild animals.

Jack and Colton are pushed to limit and are forced to conquer their fears in Washington's North Cascades National Park.

A look at the range of ecosystems across the Olympic National Park in Washington, including mountains, rocky coast and rainforest; the fauna across this diverse environment include mountain goats, marmots and spotted owls.

Jack and Colton explore the desert landscape around Novarupta, the volcano responsible for the largest eruption of the 20th century; follow this journey of overcoming full of exotic scenery and very difficult stretches.

Jack and Colton visit the Voyageurs National Park in Minnesota and experience the lifestyle of their pioneers; the journey includes a difficult canoe route and hunting for food in nature.