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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

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.

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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.

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

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.

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.

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.

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.

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.

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.