With extraction just days away, one survivalist goes against the group, is banished and must try to complete the challenge alone; Gwen and Sarah deploy crossbows as they push for one last kill; a deadly snake could end someone's challenge on Day 40.

Wes and team get their third big-game kill, but the victory quickly becomes an unexpected and very dangerous medical situation; a broiling heat wave pushes temperatures to 130 degrees and tests Bulent's ability to survive solo.

Wes scores another kill, but when a large group enters their camp, the win creates tension. A desperate Bulent migrates to Seth's watering hole. Seth is open to a partnership but Bulent remains solo and quickly gets a major food win in Seth's backyard.

Brutal heat punishes Suzanne as she makes a new start after leaving Seth; barehanded Killer Bulent takes on a monitor lizard; a potential snake attack could be Seth's first African food win; a tribe plans a move that could upend the challenge.

An unlikely alliance scores the challenge's first big-game kill; Suzänne risks her survival by banishing herself from Seth; Bulent wards off hyenas and baboons; on a two-day hunting mission, Ryan's surrounded by deadly predators.

Makani desperately pushes through the broiling valley to find a new tribe; Ryan hatches a high-risk plan to get a kill; Suzanne plots her exit from Seth, but Africa's heat thwarts her plan and forces a survivalist to leave the challenge.

A brutal windstorm punishes the survivalists; a falling-out with Bulent leads Makani to banish herself and risk going it alone; Kate finds a new group, and the desperate team goes on a hunt that could make or break its challenge.

Desperate for food, Gwen and Sarah lead the charge to build a crossbow in the bush; Ryan feels the pressure to provide; when new wildlife moves into his camp, Bulent is pushed to the edge; medics remove a survivalist from the challenge.

After self-banishing, Kate is slammed by Africa's wrath; desperately hungry, Bulent gets a major score with his bare hands; Wes and Gwen's first big food win goes wrong, threatening their health and challenge.

As temperatures soar, survivalists try to hunt while being hunted themselves. At Camp Murder Puddle, the group fights off a night attack by aggressive crocodiles. A team in turmoil leads to the first self-banishment of the challenge.

Medics closely monitor Jeff's high fever and prepare for his evacuation; the others scramble for a five-mile extraction journey through shark-infested waters; a survivalist pushes too hard leading to a medical emergency on the open sea.

The group is devastated when two critical survivalists leave the challenge; with just 10 days left before extraction, Jeff is forced to change his survival strategy but a medical emergency quickly has him on the brink of a tap out.

A grueling five-mile hike into the snake-filled jungles of the Palawan island tests the three remaining teams of survivalists; the one-day journey turns into two days of chaos, and one survivalist must be medically evacuated from the challenge.

A survivalist on a hunting expedition is bitten by a snake and requires an emergency medical evacuation; tensions arise between teams as hunting grounds get territorial; one group scores protein while their neighbors are on the brink of starvation.

Since the open sea is too dangerous to navigate, survivalists trek through a jungle filled with venomous centipedes, vipers and monitor lizards.

Ambushed by tropical storms, the survivalists are pounded by torrential rain and heavy surf; survivalists are stalked by sharks after taking to the open seas; one survivalist reaches his or her breaking point due to the storms and lack of food.

Desperate and depleted by their 60-day challenge, Jeff and Laura fish the South China Sea but are caught in a dangerous electrical storm on the open water; the brutal conditions on both land and sea lead to the Philippines claiming its first victim.

With resources dwindling, the survivalists venture into the shark-infested waters of the South China Sea searching for a much-needed meal; the all-female team is punished by scorching heat, brutal storms and a deadly insect.

Dropped into the South China Sea, 12 elite survivalists try to survive 40 days on land and sea; nearby, two all-star survivalists enter the same challenge looking to survive not just 40 days but an unprecedented 60 days.

As deadly predators begin to close in on the remaining survivalists, they must find the energy to secure food and start their long journey to extraction.

The contaminated fruit of a single tree sets off a shocking chain of events within a 24-hour period; illness and panic spread through the group, bringing into question whether anyone will make it to Day 40.

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.

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. This "uncensored" edition features additional information not seen in original episodes that sheds light on the competition and the survivalists.

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.

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. This "pop-up" edition features interwoven graphics that shed light on the competition and the survivalists with interesting, often humorous factoids.

Surviving in a remote outdoor location is no game, but elite outdoorsmen turn it into one in this series. In each episode, one of the participants is captured by the other four, blindfolded, dropped in a harsh, unforgiving environment -- think dense jungle, frigid glacier or rollicking sea -- and given 100 hours to find civilization, or the game is over. The other players monitor and comment on his progress from a nearby command center. The players include Terry Schappert, a master sergeant in the U.S. Army Special Forces; John Hudson, a U.K. Royal Air Force extreme survival instructor; Matt Graham, a primitive skills survivalist; former Navy SEAL Jake Zweig; and Casey Anderson, a wildlife tracker and conservationist.

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.

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.

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.

These repackaged episodes -- "uncensored," if you will -- of "Naked and Afraid" include new information and footage not shown in original airings of Discovery Channel's popular survival show. 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.

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.