Nine Naked And Afraid veterans are introduced as they prepare for the return of the most formidable group survival challenge on the planet - surviving 40 days and 40 nights in the deadly jungle of Ecuador's Amazon Basin.

All 12 survivalists return to bring viewers behind the scenes of their 40-day challenge in South Africa; with new interviews and footage.

Deadly predators begin closing in on the remaining survivalists.

The stakes are higher than ever in the season finale as deadly predators begin closing in on the remaining survivalists. They must find energy from deep within to secure food and begin their long journey to extraction.

Tragedy strikes when a survivalist wanders off alone; the contaminated fruit of a single tree sets off a shocking chain of events.

The contaminated fruit of a single tree sets off a shocking chain of events within a 24-hour period; illness and panic spread through the group, bringing into question whether anyone will make it to Day 40.

Ryan separates from the group and finds his camp circled by a deadly animal while he is sick and helpless.

Tragedy strikes when Ryan separates from the group and a deadly animal circles his camp while sick and helpless.

When Steven and Darrin fail to return from a hunting expedition, the group has no choice but to break camp and search for answers.

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.

Survivalists approach the midpoint of their challenge; the men battle for alpha status while others worry about starvation and sickness; all of them are distracted as lions tighten their circle around the camp.

As the survivalists approach the halfway point of the challenge, the battle for Alpha Male prevents them from coming together to battle starvation and sickness.

The Survivalists approach the halfway point of their brutal challenge. With starvation and 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.

After only two weeks, South Africa takes a huge toll on the survivalists; frustrations among the group, leopards and tick-bite fever threaten to take some out of the challenge.

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 enter the second week of their 40-day challenge; one group ventures off to find a new water source while another group hunts for big game.

On the drought-stricken plains of South Africa, the remaining survivalists enter the second week of their brutal 40-day challenge. A lack of water leads one group to venture off to find others and another group goes hunting again for big game.

12 show veterans begin their 40-day challenge in South Africa in the middle of a drought; includes pop-up facts.

Twelve Naked and Afraid veterans put their lives on the line and begin their 40 day and 40 night challenge in the sun-scorched bush of South Africa during the middle of a drought, while alongside the deadliest predators on the planet. Will even one survive?

12 Naked & Afraid veterans prepare for a formidable survival challenge: surviving 40 days and 40 nights in the sun-scorched bush of South Africa with dangerous predators.