On the edge of the Bermuda Triangle, five Naked and Afraid veterans -- Matt Wright, Jeff Zausch, Serena and Amber Shine, and Alex Maynard – attempt to survive on a remote strip of islands whose waters are so teeming with predators, locals call it "Shark Alley." With limited resources and punishing conditions on land, they'll have no choice but to take to the waters and compete with hungry sharks for the same food.

Survivalists Trish Bulinsky and Jeremy Upshaw re-connect to catch up with each other and watch their challenge in the Colombian jungle. They offer fresh perspective and new insights as they fight torrential rains, swarming insects and flash floods.

Bulent Gurcan and Cat Orza get together virtually to catch up with each other and watch their challenge in the Colombian rainforest. They offer fresh perspective and new insights into their struggles, partner dynamics and survival tactics.

In the frozen American Rockies, snow storms and freezing temperatures force the survivalists to make risky choices with their fire and food sources. An out of control blaze and toxic mushrooms put their challenge and safety at risk.

In the relentless Colombian jungle, a mom and National Guard vet teams with a firefighter. Violent storms and hypothermic conditions force them to huddle in bat-infested caves. A special bond develops between a survivalist and a wild monkey.

Dani Julien and Justin Bullard get together virtually to catch up with each other and watch their challenge in Andros Islands. They offer fresh perspective and new insights into their struggles, partner dynamics, and survival tactics.

A married couple goes from watching the challenge from their couch in Idaho to taking it on in the perilous Philippine jungle. Torrential rain, relentless bugs and deadly boars put their survival skills -- and their marriage to the ultimate test.

Andrea Lopez and Joe Brandl get together virtually to catch up with each other and watch their challenge in Namibia. They offer fresh perspective and new insights into their struggles, partner dynamics, and survival tactics.

Give a man a fish and you feed him for a day; teach a man to fish and you feed him for a lifetime. From shelters, traps and rafts to wilderness fashion take a look at the survivalist's most successful, yet wacky, primitive design and techniques.

In a lethal African hunting ground, a biker chick and a taxidermist have to stay on the move to survive. The pair must push across 21 miles of savannah to find food and water while avoiding a pride of lions that's tracking them every step of the way.

In the frigid mountains of Bulgaria, wolves circle a successful fan survivalist trying to conquer the 21-day challenge. Large fires are their defense against predators and hypothermia until the flames fan out of control and become the biggest threat.

Superfans Molly and Nate are dropped deep in the Amazon rainforest, a place that's taken down the best of the best. Nate and Molly lean on lessons learned from their couches to push through torrential rain, relentless bugs, and sleep deprivation.

A powerful earthquake in the Philippine jungle rattles a thrill-seeking chef and a competitive hockey mom but the territorial monkeys, rainstorms, lack of food and dehydration lead to a disastrous face-first fall.

In a unique four-person challenge, a lion attack survivor returns to Africa to face her fears. Surrounded by lions, crocodiles and cape buffalo, the tribe of four struggles against constant threats and each other as they try to survive in a kill zone

Deep in Mexico's Baja desert lies the scorching wasteland of the Devil's Canyon. A Canadian mountain man teams up with an experienced homesteader to take on the canyon's triple-digit heat, scarce water, and venomous predators.

Two survivalists are back for redemption in the Mexican jungle but torrential downpours, competing survival styles and a machete accident threaten to send them home early again.

On the edge of the Bermuda Triangle, an Army veteran dive master and a Cajun boat captain take on relentless thunderstorms and battle dehydration as they try navigate more than 20 miles of open ocean in the ultimate test of sink or swim.

Two strangers are dropped in one of the most dangerous African locations in the dead heat of Summer. Faced with aggressive hippos and charging elephants they quickly learn their place, but must mark their territory if they want to make it 21 Days.

All-star survivalists Trent and Sarah take on their toughest challenge yet in a brutal jungle of Mexico a place locals believe to be haunted by Mayan spirits. From Day One, the torrential downpours, eerie noises, and lightning strikes destroy them.

When a third survivalist is added to the mix, romantic complications make surviving the Colombian jungle's poisonous dart frogs and deadly jaguars much more complicated. Feeling left out, a survivalist's emotional breakdown puts his challenge at risk.

In the Bahamas two fans face relentless insects and aggressive sharks during hurricane season.

Underestimated his whole life, a survivalist with dwarfism tries to prove himself in the Amazon but struggles against predators and his partner.

The Amazon rainforest pushed All-star survivalist Ky to the edge with swarms of mosquitos, blood-thirsty piranhas, and aggressive pumas. Hunger and desperation lead to a risky night hunt in caiman-filled waters.

In an unprecedented Naked and Afraid challenge, identical twin sisters Amber and Serena, as well as brothers Warren and Thomas, are dropped in the African savannah. They take on rhinos, hyenas and a territorial leopard stalking their camp.