A former member of the Amish and an Australian fitness coach attempt to survive 21 days together in the harsh Colombian jungle.

Crippled by injuries and toxic frogs, an adrenaline junkie and a self-proclaimed renaissance redneck must dig deep to try to endure 21 days in Colombia.

A professional boxer and a former cop try to survive 21 days in Africa while threatened by a herd of aggressive hippos.

Three 14-day fan challenge survivalists return to conquer 21 days in the dense South American jungle. But when they are hit with torrential rains, they must evacuate from life-threatening flash floods.

After surviving a near-fatal fall, an equestrian stunt rider attempts to endure 21 days in Colombia. But when she and her partner fail to find food, they must grapple with the harsh possibility of starvation.

Two Naked and Afraid superfan critics use their armchair survival knowledge to try to endure fourteen days in the jungles of Colombia.

A photographer and an engineer believe they have what it takes to survive 14 days in Limpopo, South Africa. But after ten days without food, these fans question their ability to make it to the end.

A survivalist postpones her wedding to try to make it to 21 days with a British commando in the mosquito-infested Colombian tropics.

Two former addicts attempt to survive 21 days in the searing Black Hills of South Africa. On their road to recovery, they must contend with man-eating crocodiles, prowling lions and venomous snakes.

In this all-female tribe's challenge, two veteran survivalists return to mentor two newcomers on the perils of San José Del Guaviare, Colombia, for 21 days. But scarce food resources and torrential tropical storms take a quick toll.

In an international tribes challenge, one survivalist must cope with menstruation in the middle of the African bush.

In the premiere episode, a hunter and a farmer pool their knowledge as they attempt to survive 21 days in South Africa. But when the wildlife proves too stealthy to hunt, the survivalists take a life-threatening risk for food.