Dropped onto a frozen Alaskan glacier, All-Star survivalists Laura Zerra and Steven Hall scramble to stave off frostbite and hypothermia. Aggressive moose and porcupine are both threats and potential food sources as their skills are put to the test.

On a sun-scorched Brazilian island, aggressive anaconda and deadly stingray torment survivalists Whitney and Nathan, pushing both of them to their breaking point. Working together they use their hunting and fishing skills to try and make it 21 days.

Two pairs of survivalists are surprised when they must take on the deadly jungles of Panama side-by-side. But before their 21-day challenge begins, they have to re-think their survival strategies along gender lines.

When a third survivalist crashes the challenge, tension and jealousy are just as threatening as the piranha and jaguars of the Ecuadorian rainforest. Claims that there's more going on than just survival puts everyone's challenge at risk.

A deadly spider bite puts Gwen, an Alaskan homesteader at risk of tapping but she works with her partner to get her revenge, in the 130-degree heat of the Mexican jungle.

In South Africa's Limpopo Basin, elite survivalists Matt Wright and Gary Golding must protect novice survivalists and super-fans attorney Molly Jansen and dog sledder Blair Braverman first as separate teams for 10 days then merging on Day 11 while dealing with spitting cobras, territorial elephants and a unhappy last-minute storm. Being unused to the unyielding heat, Blair was forced to tap out on Day 14.

In South Africa's Limpopo Basin, elite survivalists Matt Wright and Gary Golding must protect novice survivalists and super-fans attorney Molly Jansen and dog sledder Blair Braverman first as separate teams for 10 days then merging on Day 11 while dealing with spitting cobras, territorial elephants and a unhappy last-minute storm. Being unused to the unyielding heat, Blair was forced to tap out on Day 14.

A survivor of rattlesnake, shark and bear attacks teams with Brooke, wife of "Naked and Afraid" veteran Matt Wright, in a vicious African feeding ground.

A haunted Colombian rain forest punishes the survivalists with threats from deadly jaguars, 300 species of snakes and relentless biting insects. But their challenge is threatened when they don't heed the curse of the jungle.

Survivalists expect to struggle against the natural threats for 21 days but when they also face supernatural phenomena - haunted locations, ancient curses and evil spirits - their resolve is tested both physically and mentally.

Pinned down by Africa's most dangerous threats elephants, hippos and lions, survivalists "Mama Kel" and Eric work together to avoid becoming prey and endure relentless storms, but a debilitating injury puts them both at risk.

All-Star survivalists Jake Nodar and Melissa Miller take on the punishingBlackwater Swampin Florida, which teems with poisonous snakes and aggressive alligators. When one of the survivalists becomes disoriented, local authorities are called in to conduct an all-out search.

In Mexico's unforgiving, cenote-covered landscape, two fan survivalists are dropped on an island filled with venomous coral snakes, territorial jaguars, blood-sucking chiquistas and a duck named Henry that they desperately want to eat for dinner.

The first "Naked and Afraid" couple faces challenges to themselves and their relationship as they take on the relentless Guyana jungle; they must work together to battle jaguars, anacondas, caiman, and more than two-million species of insects.

Avoiding the dangers of a rushing river, two survivalists brave a vast cave system in the Colombian rainforest; trying to survive 21 days, the jungle tests them with threats including venomous fer-de-lance snakes, piranhas and biting insects.

Dropped into a high-altitude jungle in Colombia, Tommy and Leah face territorial pumas and venomous fer-de-lance snakes, but the biggest threat may be the extreme temperature changes with highs of up 100 degrees and lows plummeting down into the 40's.

Naked in the jungle with a complete stranger leads to funny moments. Through blood, sweat, tears, snake bites, third degree burns, and rashes in hard to reach places Naked and Afraid survivalists have to endure, laughter can be the most critical skill.

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 predatorial jaguars, swarms of fire ants and a debilitating injury threaten their challenge.

In a punishing Brazilian savannah, survivalists Wes and Jesse deal with searing heat as well as paralyzing wasps, aggressive bees, and poisonous rattlesnakes. But a territorial jaguar family circling their shelter may cost them the 21-day 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.

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.