Competitors brace for one last battle with treacherous glaciers, rivers and mountains; teams are dropped in a glacial river valley and must reach the insertion flag where to find a cache of mountain bikes.

Only few wins remain with just two legs to go; teams must design and build handmade rafts to survive the roughest whitewater they have faced yet.

The elevation takes its toll in leg eleven as teams climb a steep Alaskan peak to reach the insertion flag, descend 2,000 feet to the Triumvirate Glacier and battle 24 miles of frigid terrain to reach Beluga Lake.

In leg ten, teams are dropped on a remote beach and can travel by land or by sea; facing dehydration, a giant pod of whales, sickness and violent rapids.

Teams are dropped on Kodiak Island and must face fierce Kodiak brown bears; teams take different routes; one man becomes separated from his team and comes face-to-face with a massive predator.

Teams are dropped on the banks of the Tazlina River and must build log rafts to conquer punishing rocks and class four whitewater.

Beginning leg seven on a remote tundra near Mount McKinley, known for some of the most brutal terrain in Alaska.

During leg six, teams must slash through a thorny gantlet of devil's club, then some head for high ground while others bushwhack through the forest.

Teams ride the historic Alaskan Railroad to a remote river valley and must traverse mountains, canyons, glaciers and an iceberg-filled lake to reach extraction.

On leg four, the teams journey by land and water as they race toward the extraction LZ on an ocean inlet; The adventurers must choose to either take boats down Six Mile Creek or make a grueling hike over a mountain pass.

Teams compete in leg three; descending 2,000 feet of snowy ridges, slopes and swamps to reach the landing zone at Talachulitna Lake.

In the second leg of the competition teams are dropped near the top of a mountain peak and must descend the mountain in any way possible.

In the first leg, teams must cross a rapidly thawing lake, crevasse-filled glacier and walls of crumbling ice to reach the summit of Mount Gerdine.

The three remaining teams battle to the top of Mount Augustine, for the glory of being crowned champion.

The teams face their toughest challenge yet; a race across an icy glacier, down a white-water river and across the open ocean.

The three remaining teams go to Kodiak Island, a temperate rainforest full of hunting opportunities.

The teams head out on an island ruled by Kodiak bears, one of the largest bears on Earth.

The teams battle through a gauntlet of dense alder thickets, cross the roaring waters of Coal Creek and scale a 600-foot rock.

The teams cross a steep ridge to the crumbling Strandline Canyon, trekking 40 miles to the landing zone, and battle quicksand and ferocious rivers along the way.

The teams will traverse the Hayes Glacier, known for its deadly crevasses.

The teams will navigate through turbulent rivers, battle deadly rapids and bushwhack thick brush.

When bears, wolves and foxes are your only neighbors, life can be pretty lonely. Add minus-60-degree days and a constant battle for the most basic necessities, and you have the daily challenges of people who live in remote corners of Alaska. This series takes viewers deep into an Alaskan winter to meet tough, resilient residents as they try to stay one step ahead of storms and man-eating beasts to survive the season. The closest neighbor to Sue Aikens is more than 300 miles away. Eric Salitan subsists solely on what he hunts and forages. Chip and Agnes Hailstone catch fish for currency in bartering for supplies, and Andy and Kate Bassich use their pack of sled dogs for transportation. Also highlighted is a time of year not always part of what viewers see in Alaska: spring! Ice is breaking, animals are waking, and residents face new tests before deep cold returns.

Each year adventurers make Alaska's mighty Yukon River their home for five weeks. They float downstream on homemade log rafts to sell firewood and other supplies to remote villages. The reality-documentary "Yukon River Run" presents hourlong episodes tracking the progress of various crews. As harsh winter months approach and threaten both safety and success, stakes are heightened as rafters endeavor to cash out and escape from the cold.

Patrolling America's largest state is the job of roughly 400 troopers in one of the toughest law enforcement agencies in the nation. Essentially, these cops say, nearly every Alaskan resident is armed and they know how to use their weapons, which makes any scenario a trooper encounters a potentially fatal one. Follow along as the "blue shirt" Alaskan State Troopers police the towns and villages, and the "brown shirt" Alaska Wildlife Troopers enforce regulations covering both commercial and sport fishing and hunting activities.

Money and goods mean nothing to the people in "Live Free or Die." The series depicts a trend called "rewilding" -- the undomestication of humans -- and follows those who've rejected a mainstream existence to live off the land, in simple homes without electricity or running water. Being self-sufficient is a constant challenge, as obstacles like brutal weather and depleted food stocks require quick, innovative solutions. Modern pioneers include Colbert, a former financial adviser now living in a Georgia swamp; Gabriel, whose California lifestyle alternates between the mountains and the sea; and Tony and Amelia, who turned a hillside in the Blue Ridge Mountains into a garden.

Wilderness guide and survival instructor Hazen Audel attempts to stay alive in some of the world's most inhospitable places by using centuries-old techniques. Hazen joins tribes in the rainforests of Ecuador, the Kalahari Desert of Namibia, the mountains of western Mongolia, the frozen Arctic of Canada, in equatorial Kenya, and on a remote island in the Pacific Ocean to learn the skills firsthand. He hunts with bows and poisoned arrows, climbs harsh mountains in search of prey, and harvests food beneath shifting sea ice, among other challenges that push him to his limits.

Famed survivalist Bear Grylls says goodbye to Hollywood and takes celebrities on journeys into some of the wildest locations in the United States and around the world. Whether it's searching for food in the most remote environments or battling intense weather, each episode chronicles the celebrity's experience of pushing their body and mind to the limit to successfully complete the adventure.