Actress Courteney Cox joins Bear to maneuver across jagged peaks and descend sheer cliffs on the windswept coast of Ireland.

Actor Joel McHale joins Bear Grylls for an adventure in the Arizona desert.

Singer Nick Jonas accompanies the renowned survivalist on another journey into the wilderness.

Tennis player Roger Federer joins Bear on a journey through the Swiss Alps; Bear and Roger descend a frozen waterfall, use tennis rackets as snowshoes to cross a frozen lake, ascend a steep cliff, and play table tennis.

Actor Jesse Tyler Ferguson joins Bear on a 6,000-foot descent along the cliffs and ridges of Croda dei Toni; Ferguson shares insight about his sudden rise to fame.

Bear and Olympic gold medalist Lindsey Vonn take a speedboat trip, then swim to shore and make their way along a rugged coastline; after traversing a deep chasm, they collect a dinner of sea urchins.

Professional football player Drew Brees and Bear climb a bat-infested cave and wrestle a six-foot crocodile in Panama's Camino de Cruces jungle.

Actress Brie Larson accompanies Bear Grylls on a jungle adventure across a remote island in the Gulf of Panama.

Oscar-nominated actress Kate Hudson goes on a journey with Bear that involves a treacherous mountain range in Italy; Kate shares details of her unique upbringing.

Actor Michael B. Jordan joins Grylls in Wales where they start their journey by dropping into rough waters off the coast before making their way up the coast and to the top of the mountains for their exit.

Bear and Super Bowl champion Marshawn Lynch tackle a rugged mountain range that has sharp cliffs and dark chasms; the pair comes face to face with the French Foreign Legion and pursues a wild hog for dinner.

Actress Michelle Rodriguez and Bear go to a desert Nevada; unexpected high winds during a sky-diving trip send Michelle off course; Michelle and Bear must come up with clever ways to stay hydrated.

Actor James Marsden and Bear venture into the heart of Utah's Rattlesnake Canyon, where they are faced with a chuckwalla lizard.

Spice Girl Mel B joins Bear on the two hundred foot cliffs of the Welsh coastline, where a final descent sends Mel into breakdown mode; Bear is stung by a jellyfish, forcing Mel to practice some first aid skills.

Actor Sterling K. Brown joins Bear in the high mountains of Colorado, where they battle plummeting temperatures while descending a sheer rock face, track an elusive deer and rappel down a waterfall.

Bear leads actor Zac Efron on a survival journey into the Northeast Appalachian mountain range.

Bear and NBA legend Shaquille O'Neal are lifted from a freight train via helicopter and whisked away to a dense forest in the remote Adirondacks; they face blood-sucking leeches and a 200-foot rock face as they search for their exit.

Bear spends two days traveling through Yosemite National Park with actor Channing Tatum.

Bear takes actor Ben Stiller into the rugged mountains of the Isle of Skye in Northern Scotland.

Bear and actress Julianne Hough navigate the unforgiving terrain and wild animals of the African savanna; Julianne talks about her adolescence and her determination to succeed.

Actor Don Cheadle joins Bear on a trek through the mountains of New England, which includes crossing a raging river and a climb to a towering railroad bridge; Bear considers a porcupine carcass for dinner.

A seasoned adventurer and survivalist deliberately "strands" himself in remote locales and makes his way back to civilization to provide in-depth advice for travelers who may find themselves lost on what was expected to be a routine hike or other trip.

Extreme survivalists go head to head in a race across the Alaska wild. Using ingenuity, experience and just the gear they can carry in their packs, the participants have 60 hours to reach the finish point of each leg of the adventure -- the series features 13 legs -- and in addition to navigating treacherous glaciated river valleys, barren ridgelines, and high mountain peaks, the challengers battle hunger, dangerous predators and unpredictable weather. There is no grand prize awaiting each leg's winner, other than the pride of accomplishing a grueling feat. For season three, the 12 competitors are divided equally into four teams -- Military, Endurance, Alaskans and Lower 48.

Discovery Channel takes the ubiquitous survival show theme to the next level by stripping it to its bare essentials. In "Naked and Afraid," complete strangers -- usually a man and a woman -- meet in a very unique way: They're stranded in a dangerous, desolate location, without food or water, and they're completely naked. Each episode follows the adventurers as they attempt to survive on their own with nothing but a personal item and the knowledge that the only prize is their pride and sense of accomplishment. Because there is no other choice, competitors quickly get to know one another -- and their surroundings -- and hope that their instincts, survival skills and intestinal fortitude serve them well.

World famous adventurer and survival expert Bear Grylls reveals the true stories of ordinary people who found themselves in extraordinary life or death situations. Bear ventures into jungles, snow-capped mountains, burning deserts and steep canyons to replicate the key moments and terrifying realities of the encounters, from bandit attacks and avalanches, to being lost in ferocious sand storms and being confronted with bears. He talks about what the survivors did to help their cause, and demonstrates some of the mistakes they made along the way that nearly cost them their lives.

TV's most extreme survival challenge just grew extra-large. Veteran survivalists familiar with the stripped-down drill after appearing on "Naked and Afraid" attempt to survive in a desolate, dangerous environment for 40 days -- 19 more than they previously experienced on the show. Pushing the very limits of human endurance, the men and women must all vie for the same limited food, water and shelter while avoiding territorial-sensitive predators and venom-filled reptiles. Because there is no other choice, the competitors quickly get to know one another -- and their surroundings -- and hope that their instincts, survival skills and intestinal fortitude serve them well.

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.

Men and women from all walks of life and every corner of the country come together to pursue their common dream of reaching Mount Midoriyama on the world's most notorious obstacle course. Each possessing an inspiring story and a memorable personality, these unrivaled athletes push through seemingly impossible tests of strength and endurance. Though few have ever finished the course, the challengers stop at nothing as they take on a growing number of competitors and an ever-changing set of obstacles.