Dropped into a high-altitude jungle in Colombia, Tommy and Leah face territorial Pumas and venomous fer-de-lance snakes, but the biggest threat is the extreme temperature changes, where highs hit nearly 100 degrees and lows plummet into the 40s.

Being naked in the jungle with a complete stranger can lead to funny moments, and laughter can be a critical skill when trying to survive through blood, sweat, tears, snake bites, burns, and rashes in hard to reach places.

In the mountainous rainforest of Honduras, a survivalist with an unusual past is paired with a hard-headed police detective to try and survive 21 days, but predatory jaguars, swarms of fire ants and a debilitating injury threaten their challenge.

In sun-scorched Brazil, survivalists Wes and Jesse try to complete their 21-day challenge, but a jaguar crossing into their camp puts them on high alert. Starvation forces Jesse to attack a beehive in search of honey and the entire colony retaliates.

In sun-scorched Brazil, survivalists Wes and Jesse try to complete their 21-day challenge, but a jaguar crossing into their camp puts them on high alert. Starvation forces Jesse to attack a beehive in search of honey and the entire colony retaliates.

Dropped into Guyana's scorching savannah, two Naked and Afraid superfans fight the oppressive heat and constant insect attacks. Scorching temperatures lead to severe dehydration and force a desperate fan to risk illness by drinking unsanitary fluids.

All-stars Fernando and Dani land in a rainforest in Ecuador for their third challenge, where jaguars, caiman, anacondas and bullet ants are on the prowl; their divergent approaches to primitive survival might do them in.

Survivalist Lynsey copes with her lone-wolf partner Darvil in South Africa.

Three young survivalists test their skills in the coastal rainforest of Ecuador, where they risk their lives scaling a massive rock cliff to forage for food.

Two teams of international survivalists attempt to endure in South Africa.

Two fan survivalists are in over their head in brutal South Africa.

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A football coach and midwife attempt to overcome the curse of Chiapas, Mexico, a location so daunting that no survivalist has completed 21 days. But their radically different approaches to survival hurt their ability to endure.

A transgender Vet and a South African farmer tackle the deadly bush of Zambia where territorial elephants, baboons and crocodiles threaten their every move.

After his brother is medically tapped, a South African sibling seeks redemtion in Zambia, paired with an endurance athlete from Louisiana. But vindication proves harder than expected.

A wilderness guide and a software engineer try to endure 21 days in the Botswana desert. But at night, their safety is threatened by roaming lions and aggressive elephants.

For the first time, two young adult kids of veteran survivalists try to prove they are as good as their parents when they take on 21-days in a dense Mexican rainforest where they face pumas, jaguars, and deadly fer de lance snakes.

Fan survivalist Matt, notorious for his former partner sharting in their water source, teams up with environmentalist, Kerra, to take on 21-days in Zambia. Dropped in a valley teaming with leopards, will he have another environmental disaster?

A wilderness EMT and a hard-headed homesteader try to survive in a coastal Colombian jungle. But when their priorities clash, their partnership becomes volatile.

Legend survivalists Max and Rylie are dropped in the South African bush with two novice fans to try and survive 21 days with spitting cobras, aggressive warthogs, rhinos and leopards.

Two women and two men face off in South Africa to see who can survive 21 days. Pursued by leopards, lions, and hyenas, who will tap first — the men or the women?

Two survivalists try to endure 21 days in the wreckage of an abandoned village in Botswana's Okavango Delta, where aggressive hippos have claimed the territory.

Two survivalists take shelter in a labyrinth of caves in Colombia.

Language barriers stand between two survivalists in the South African bush.

Two foreigners try to become the first survivalists to endure 21 days on U.S soil. But rattlesnakes, unfamiliar terrain and plummeting temperatures threaten to send them back across the pond. Lilly from Austria and Sam from the UK team up to do battle with the New Mexico wilderness.