Bear Grylls puts actor Channing Tatum's survival skills to the test in the wilds of Norway.

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.

Actor Scott Eastwood joins Bear on a journey through the harsh Bulgarian outback; the duo rappel from a towering arch, cross a raging river, descend into a dark cave and face off against a snake; Scott details growing up with his famous father.

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

Radio personality Bobby Bones joins Bear Grylls in a massive Norwegian fjord where danger lurks at every turn.

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.

Bear Grylls leads actress Cara Delevingne up the mountains of Sardinia, where she pulls herself across a horizontal line suspended 200 feet in the air and rappels down a waterfall.

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.

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.

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

Bear and Joseph Gordon-Levitt navigate Kenya's unyielding terrain; Joseph and Bear navigate a perilous rappel, milk a camel for hydration, ascend a massive rock dome and battle a crocodile for dinner; Joseph talks about his family and rise to fame.

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 Grylls and former WWE World Champion Dave Bautista trek through the Arizona desert.

Actor Rob Riggle joins Bear Grylls on an adventure through Iceland's Vatnajokull Glacier.

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

Rock climber Alex Honnold joins Bear for an adventure through the Swiss Alps.

Actor Armie Hammer and Bear Grylls scuba dive in search of a sea cave used by smugglers.

Bear Grylls and Zachary Quinto race against time to traverse the Panamanian jungle before a storm causes landfall.

Bear takes former professional football player Deion Sanders to the mesas and canyons of Utah for his first ever camping trip.

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

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.

Teamwork in a survival situation is of utmost importance. But what happens if the team consists of a mismatched husband and wife, trying to survive in harsh outdoor conditions while rarely seeing eye to eye? That's the scenario in "Man, Woman, Wild," which features former Special Forces survival expert Mykel Hawke and his wife, Ruth, a journalist, who are plunked in a remote location for four days and nights. From building a shelter to hunting for food to finding a way out, Mykel and Ruth must find common ground as he teaches her the skills to survive in the wildest places on Earth.

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.

Adventurer Ed Stafford has walked the length of the Amazon River -- he is the first person to accomplish that -- so perhaps being stranded on a desert island near Fiji without clothes, food, water and tools and attempting to survive for 60 days isn't that daunting. The only possessions he does have are cameras, and so viewers are provided a fly-on-the-wall perspective of Ed's attempts to find food, make fire, process water to drink, and build a shelter -- among many other tasks that will help him stay alive.

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.

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.

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.

Surviving in the wild is not an exact science. Beyond the basics of finding water, food, shelter and eventually help, opinions vary. Two experts tell how they think it's done in this series, as initial episodes feature trained survivalists Dave Canterbury and Cody Lundin demonstrating the skills and creative thinking that can help one cope in tough surroundings. Equipped with minimal gear, the pair are left in remote locations -- an uninhabited island off Nova Scotia, a New Zealand mountaintop, deep in the Everglades, the jungle of Thailand, and the desert of Baja California, to name a few -- where they battle the elements and sometimes each other. Season 3 introduces U.S. Special Ops veteran Joseph Teti to replace Canterbury, in the middle of Season 4 primitive survivalist Matt Graham of Discovery's "Dude, You're Screwed" replaces Lundin, and partway through Season 5 producers forge new partnerships by rotating survival experts as hosts.