A biker chick and a taxidermist have to stay on the move to survive an African hunting ground; the pair pushes across 21 miles of savannah to find food and water.

Tommy and Leah are dropped into a high-altitude jungle in Colombia, facing territorial pumas and venomous snakes, but the biggest threat is the extreme temperature changes; pop-up edition.

In this Pop-Up Edition, a thrill-seeking chef and competitive hockey mom are rattled by an earthquake in the Philippine jungle. Fun and interesting factoids appear on screen as territorial monkeys, hunger and dehydration nearly lead to their demise.

In this Pop-Up Edition, a couple goes from their Idaho couch to the perilous jungles of the Philippines. Fun and interesting factoids appear on screen as relentless bugs, torrential rain and deadly boars put their survival skills to the test.

In this Pop Up Edition, two survivalists take on Mexico's Baja desert. Fun and interesting factoids appear on screen as they deal with triple-digit heat, scarce water, and venomous predators.

In this Pop Up Edition, two survivalists are back for redemption in the Mexican jungle. Fun and interesting factoids appear on screen as torrential downpours, competing survival styles and a machete accident threaten to send them home early again.

A single mom and an optimistic novice try to survive the wild coast of South Africa.

An Army veteran and a Cajun boat captain take on relentless thunderstorms and battle dehydration on the edge of the Bermuda Triangle.

The first couple to ever take on the 21-day challenge tests themselves and their relationship as they take on the relentless Guyana jungle; pop-up edition.

Two fan survivalists are dropped on Mexico's unforgiving, cenote-covered island filled with venomous coral snakes, territorial jaguars and blood-sucking chiquistas; pop-up edition.

More light is shed on Adam and Jaclyn's adventure in Nicaragua.

One survivalist falls into a roaring fire after weeks of depleted energy due to no food; with just days to go, the pair makes a daring plan, but it may cost them the challenge.

A mountain man and a former cop attempt to survive in Namibia.

Max and Bianca face off with aggressive caiman, boa constrictors, large spiders, and thorny mangroves in this Superfan challenge on a tropical island in Panama; with insider facts and footage.

A survivalist with an unusual past and a hard-headed police detective try to survive 21 days, but jaguars, fire ants and a debilitating injury threaten their challenge; pop-up edition.

Polar opposites Angela and Darrin try to survive for 21 days while competing with monkeys and rats for food.

When a third survivalist crashes the challenge, tensions and jealousy are just as threatening as the piranha and jaguars of the Ecuadorian rainforest; with pop-up facts.

A bigfoot believer who is afraid of the dark; a tough mom who has never left home.

An ex-military and a mountain mom take on the jungles of Panama; a harsh environment is teeming with killer bees and other insects.

Tormented by hostile crocodiles and territorial howler monkeys, and with no tree canopy to protect them from the sun in the post-hurricane Nicaraguan jungle, one survivalist suffers third-degree sunburn while illness threatens the other's life.

Aften and Zack battle harmful health issues, a team dynamic breakdown, critical survival malfunctions and a massive psychological decline in Guyana.

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.

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.

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.

Episodes of "Naked and Afraid" with additional content.

Episodes of "Naked and Afraid," with additional content.

Episodes of "Naked and Afraid XL" with additional content.

Featuring "Bugged Out" interviews from the survivalists.

The producers of National Geographic Channel's hit series "Life Below Zero" are behind "Port Protection," which profiles individuals trying to survive way above the Lower 48. Surrounded by the North Pacific, Port Protection is a remote community tucked into the northwest corner of Prince of Wales Island, Alaska. The approximately 100 residents who call the rugged, unforgiving land home push the limits of survival, living an isolated and risky existence of self-reliance with no roads, government or law enforcement. However, they think the risk is worth the profound reward: a world of beauty with the security of community without the constraints of bureaucracy.

"The Wheel" puts a new spin on the adventure series genre by linking the moon's phases to the types of deadly terrains survivalists try to conquer. Six players -- none are typical survival experts, but rather everyday people who have something to prove -- are dropped in six distinctly different, treacherous landscapes across South America. Unbeknownst to the players, the time they spend at each spot is determined by the lunar calendar; with every phase of the moon, "the wheel" turns and sends each person to a new eco-zone. Equipped only with light survival packs and devices that can be used at any time to quit the challenge and call for help, participants must fight for their lives by procuring food, water and shelter. And when the wheel turns again, they are thrust into a new location, forced to use a completely different set of skills while attempting to survive six lethal environments over the course of 60 days.