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.

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.

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.

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.

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

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.

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

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.

The Survivalists approach the halfway point of their brutal challenge. With starvation & sickness worse than ever they must come together to help one another, but the battle for Alpha Male distracts them from their strategy and may be their downfall.

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.

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