Two survivalists face many challenges while trying to survive 21 days in the Costa Rican rainforest without food, water, or shelter.

A California Buddhist and an Oregon fisherman test their skills against the unforgiving Australian outback, where harsh conditions, scarce food sources and saltwater crocodiles threaten their survival.

Two survivalists are back for redemption in the Mexican jungle but torrential downpours, competing survival styles and a machete accident threaten to send them home early again; a pair attempt 21 days in the Baja desert's brutal Devil's Canyon.

An Army vet and a newly married man grapple with gender norms as they take on the mountains of Croatia; extreme hunger and frigid temperatures force this unlikely pair to bond together, but a vicious storm threatens to rip them apart.

Christina and Steve tackle the Mexican jungle of Quintana Roo for 21 days, but tensions rise between them.

On the edge of the Bermuda Triangle, an Army veteran dive master and a Cajun boat captain take on relentless thunderstorms and battle dehydration as they try navigate more than 20 miles of open ocean in the ultimate test of sink or swim.

When a third survivalist is added to the mix, romantic complications make surviving the Colombian jungle's poisonous dart frogs and deadly jaguars much more complicated.

An ex-marine and a perky Southern girl face constant downpours, cabin fever, threats from predators, lack of sleep and extreme hunger in the Panamanian Jungle.

Alana Barfield and Keith Busch attempt to survive on a Fijian island with minimal water and little food.

An extreme athlete and a book smart bartender tackle an Ecuadorian cloud forest where it rains daily.

Underestimated his whole life, a survivalist with dwarfism tries to prove himself in the Amazon but struggles against predators and his partner.

Corinne Kohlen and Chris Fischer contend with a barren topical terrain as they are dropped on a deserted Dominica beach.

In a brutal Mexican jungle known to be haunted by Mayan spirits, All-star survivalists Sarah and Trent are tormented by rain, predators and spirits of the rainforest.

In Canada, a marine biologist and a special forces veteran face not only a harsh climate but also deadly wildlife.

In the Amazonia jungle a horse trainer and an anxious wilderness instructor face constant rain and a lack of resources.

A survival instructor and a pediatrician brave storms, cold and hunger in Argentina's Yungas Cloud Forest.

A hunter from Louisiana and a surfer girl from California must survive on a deserted island in the Philippines.

Jeremy and Melanie continue their challenge in the haunted swamps of Louisiana, enduring threats from predators as they search for food.

A deadly spider bite puts Gwen at risk, but she works with her partner to get her revenge in the 130-degree heat of the Mexican jungle.

A haunted Colombian rainforest punishes the survivalists with threats from deadly jaguars, 300 species of snakes and relentless biting insects; the challenge is threatened when the survivalists don't heed the curse of the jungle.

Stalked by aggressive leopards and unable to get fire for protection, survivalists Angela and Chad fight the elements and each other as they look for double redemption in South Africa.

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.

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.

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.

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.

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.

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.

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.

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.