A sneak peak at the upcoming season which includes a cast of returning competitors as they attempt to survive in Colombia for 40 days and 40 nights.

Veteran survivalists are dropped into the badlands of Colombia, where they must survive for 40 days and nights with no food, water or clothes.

After a week of being dropped into the dangerous and desolate badlands of Colombia with no food or water, one survivalist has already tapped out, another is on the brink, and hunger, thirst, and distrust are threatening to take down several more.

After fourteen days, many who remain are struggling to adapt to their environment and each other. Some consider migrating to try and find new resources, while in other camps tension continues to rise and may lead to our second tap out of the season.

After nearly three weeks in the bush, two survivalists have tapped out and most others are making desperate treks across the savannah in search of food. If they can't find sustenance, they'll be forced out of the most difficult challenge of their lives.

The 10 remaining survivalists cross the 21-Day milestone and enter into unchartered waters. Scarce resources send the survivalists on a collision course. They fight for their lives with a huge electric eel and are visited in the night by a gigantic puma.

With 15 days to go in the 40-day challenge, the ten remaining survivalists - dehydrated and protein starved - find themselves converging at dangerous Piranha Lake where they will they compete over scarce food and water.

After thirty-one days in the Colombian jungle, the pressure is on to get the nourishment they need to survive extraction, but when one member doesn't play by the rules, the future of one group is thrown into jeopardy.

The final, and most difficult, part of the 40-day challenge begins. Jeff and EJ decide to attempt their extraction alone, and relationships grow contentious between both teams as they navigate the treacherous landscape to try and finish the challenge.

The "dirty dozen" survivors from Naked and Afraid XL come together for the first time since their life-changing 40 day challenge. They'll discuss good times, hard times, and try to heal unresolved issues.

12 Naked and Afraid veterans begin their 40 day and 40 night challenge in the sun-scorched bush of South Africa during the middle of a drought and alongside deadly predators.

On the drought-stricken plains of South Africa, a lack of water leads one group to venture off to find others and another group goes hunting for big game.

Only two weeks in and South Africa is already taking a huge toll on our survivalists, mentally and physically. Frustrations between survivalists explode, deadly leopards circle, and cases of tick-bite fever threaten to take some out of the challenge.

Steven fails to return with Darrin from their two-day hunting expedition, leaving the group with no choice but to break camp in a desperate search for answers.

Ryan encounters a wild animal while he's defenseless and without the help of the group.

In a 24-hour period, the contaminated fruit of a single tree sets off a shocking chain of events. As panic and illness spread through the group it's questionable whether anyone will make it to Day 40.

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.

All 12 survivalists return to bring viewers behind-the-scenes of their epic 40-day challenge in South Africa

Nine Naked and Afraid veterans attempt to survive the deadly jungles of Ecuador’s Amazon Basin for 40 days and 40 nights. To make it out alive, they’ll have to master the environment, push the limits of human endurance.

The seven remaining survivalists enter the second week of their 40-day challenge in the bug-infested Amazon Jungle.

Lacey's night-fishing plan yields a boost in strength and team morale. Lack of food and sleep at Camp Laguna Negra makes Shannon spiral downward. Matt and Russell take to the water and score another huge protein win.

While mourning the loss of their chief provider, the remaining five survivalists learn they are not alone in the jungles of the Amazon and are given an opportunity to join forces with others.

Days after the arrival of a new team member, division among the remaining six survivalists deepens as Russell leads the men on a risky two-day hunting expedition.

Four weeks into the brutal 40-day Amazon challenge, a violent two-day storm descends on the jungle. Before it's over, one more survivalist will be gone... leaving another hanging by a tenuous thread.

The remaining survivalists struggle to regroup in time for a brutal two-day, 15-mile water extraction journey.

Stalked by lions, hyenas and aggressive crocodiles, 13 all-star survivalists try to survive for 40 days in Africa's sun-scorched Selati Basin. Resources are scarce and when one group scavenges meat, hungry predators stalk their camp.

An attack by a venomous predator puts one of the survivalists at risk just three days into the challenge. With food scarce, the other competitors hunt warthogs and impalas but as they track their prey, the survivalists are also being stalked.

One survivalist takes a huge risk and enters a leopard kill zone to secure a big kill for his team. A massive storm unleashes torrential rains on each camp and the temperature plummets nearly 40 degrees.

Freezing rainstorms torture the remaining survivalists, risking severe hypothermia, and a successful hunt ends up backfiring and could cost two survivalists the challenge.

One camp throws themselves into the lion's den to hunt for big game, while the other camp bands together for a group hunt and ends up finding a dangerous and unexpected food source.

A devastating injury and a vicious storm that destroys the survivalists' food supply threatens to tear apart the newly merged camp.

XL All-Star Matt Wright seeks redemption as he takes on the brutal challenges of surviving Africa by himself. After more than 20 days alone, Matt begins a search for the other XL survivalists.

Risking retaliation from a dangerous nearby leopard, two survivalists scavenge the predator’s kill to provide food for the team. Matt Wright joins the other survivalists and immediately causes a confrontation within the group.

Survivalists embark on several dangerous hunts to secure protein and prepare for their arduous extraction on the horizon.

Brutal injuries and life-threatening illnesses end the 40-day challenge early for even the most elite survivalists. Through unseen footage and interviews, the survivalists offer insight and perspective on the most memorable moments when it all went wrong.

In an epic two-hour event, the weak, divided group gets a much-needed victory when the hunters score a kill. To finish the challenge, the survivalists must complete a brutal extraction across deadly killing fields of lions, crocodiles and leopards.

The survivalists come face to face for the first time since their 40-day challenge in Africa.

12 elite survivalists enter an unprecedented 40-day XL challenge. In the ocean off the coast of the Philippines, they must survive a shark-infested ocean and then face the dense Philippine jungle crawling with deadly snakes and monitor lizards.

12 elite survivalists are dropped into the brutal South China Sea where they must survive 40 days on land and sea. Plus, 2 All-Star survivalists enter the same challenge looking to survive not just 40 but an unprecedented 60 days.

With resources dwindling, the survivalists venture into the shark-infested waters of the South China Sea searching for a much-needed meal.

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.

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

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.

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.

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 puts him on the verge of a tap out.

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.

Season finale. Medics closely monitor Jeff's high fever and prepare his evacuation. The others scramble for a 5-mile extraction journey through shark-infested waters. A survivalist pushes too hard leading to a medical emergency on the open sea.

Jeff is called out for his "no hand-outs" survival strategy but refuses to back down. Through a free-wheeling discussion, new interviews, and never-before-seen footage, it's a new look into how the survivalists survived land, sea and each other.

12 survivalists take on a 40-day XL challenge in the ferocious, heat-stricken, deadly South African bush, a location so challenging ancient tribes would banish the weak. Now, these survivalists will do the same if someone isn’t pulling their weight.

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.

After self-banishing, Kate is slammed by Africa's wrath. Desperately hungry, Bulent gets a major score with his bare hands but can Makani put aside her vegan beliefs? Wes and Gwen's first big food win goes wrong, threatening their health.

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 their challenge.

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.

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.

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.

Wes scores another kill, but when a 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.

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.

Desperate for food, Gwen and Sarah lead the charge to build a crossbow in the bush while Ryan feels the pressure to provide.

With extraction just days away, one survivalist goes against the group, is banished and must try to complete the challenge alone.

12 of Naked and Afraid's best battle their biggest challenge yet - 60 days in Louisiana's punishing swamps.

With a huge 8-foot alligator win, Gary eats parts that are too much for his team and his stomach.

To cross the gator-filled swamp, Rylie, Matt and Ryan engineer an epic 50-foot bridge in a desperate attempt for resources. Harassed by a black bear, Jeff and Steven must abandon their camp. EJ stalks a gator who has been stealing his fish.

An eye-popping, reckless move puts a survivalist's challenge at risk.

Two survivalists confront sub-freezing temperatures in the swamp.

The Peruvian Amazon's aggressive piranha, venomous fer de lance and even poisonous plants test 12 survivalists. XL rookies look to last 40 days while vets try to make 60 and become Legends. Four survivalists will be gone in the first four days.

The Peruvian Amazon. A rich, beautiful rainforest where thousands of species of animals and plants want to kill you. Now, 12 survivalists begin a new XL challenge there -- some going for 40-days, others attempting 60-day legend status.

Steven takes a huge risk when he raids a caiman nest for eggs; Dan and Waz join forces to snare the vultures circling their camp; Amber, Trish and Jen take on a huge project, but tensions could tear them apart.

Three elite survivalists join the challenge; Dan and Waz take on dangerous prey; Amber battles an aggressive caiman to feed her team; Steven's main source of food turns sour.

The Legends put their mark on the challenge; desperate to get food for Steven, EJ creates poison blow darts to chase a much-needed meal; Matt spearheads an ambitious dock build that drains Dan's strength; Jeff adds to the tension on Amber's team.

Jeff struggles to keep food down; Trish and Amber hit a breaking point; Matt, Dan and Waz cross piranha-filled waters and score a big kill; EJ and Steven's new camp is stalked by a jaguar; a survivalist leaves their group to go solo.

With Amber gone, Trish and Jen must fend for themselves; Amber joins forces with Steven and EJ. A distant fishing hole means a punishing journey for their next meal; after a huge food win, Dan and Waz make a high-risk choice.

Desperate for food ahead of their Day 40 extraction, Jen pushes Trish to hunt new territory. Dan, Waz and Matt corner one of the Amazon's apex predators, a six-foot caiman. When Trish and Amber's paths cross again, tensions re-surface.

Pushing past day 50, the final six survivalists come together as one group, but must scramble to expand their shelter; the Amazon unleashes a bee swarm and a torrential storm; a knife accident threatens a survivalist's challenge.

With the day 60 extraction looming, a hunt goes awry and leads to an all-out jungle search for wounded prey; the team's large-scale raft build could be a crushing waste of time and calories; a survivalist decides this will be their last challenge.

Twelve elite survivalists venture to Montana's sub-zero conditions in the Rocky Mountains.

Waz and Jake risk hypothermia to dam a frigid stream for trout fishing.

Scrambling from the start, 12 elite survivalists take on their harshest location yet, the sub-freezing Rocky Mountains of Montana. Jake injures his feet during insertion but tries to push through. Severe dehydration puts a survivalist's challenge at risk.

Snowstorms test the survivalists' will leading to a leadership change.

Wes confronts Sarah and a mountain lion stalks the survivalists.

A grizzly bear mauling leads to a frightening search-and-rescue mission.

Twelve brave souls take on their first XL challenge in the Colombian Badlands. Survivalists must battle disease-carrying insects, scorching heat, six-foot caiman and stalking jaguars. In this unprecedented challenge, they must trek 40 miles in 40 days.

Adam, Heather and Sam score a protein win, but the trek through Colombia's badlands puts the team at risk; Chris battles a mystery illness; Nathan reveals a secret to his partners; the Proving Grounds send a survivalist home.

Malorie and Shell set their sights on an elusive caiman while Adam and Heather build a raised platform shelter to save Sam from ant attacks.

A newly formed tribe quickly works together to stalk and kill a caiman. The pressure to trek 40 miles to extraction pushes two teams to make risky migrations. A survivalist is on the brink when medics discover parasites in their digestive system.

A massive food win buoys Terra and their whole team. On the heels of a caiman kill, Malorie sets her sights on a bigger prize. Heather is shocked when Adam tells her he has not been sharing food. A scorching migration could end Heather's challenge.

Far from extraction, Kaiela leads her team on a punishing trek that puts her challenge at risk.

The remaining survivalists join forces; when the group splinters to hunt resources, it leads to a big protein win but creates tension between Lynsey and Terra.

Facing an unprecedented two-day extraction, the final eight survivalists hunt, fish and trap potential food.