Naked and Afraid

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

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

Two fans face relentless insects and aggressive sharks during hurricane season in The Bahamas.

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.

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. The torrential downpours and eerie noises threaten to destroy them.

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.

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

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.

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.

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

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

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 extreme sleep deprivation.

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.

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 savanna to find food and water while avoiding a pride of lions that's tracking them every step of the way.

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.

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, and a special bond develops between a survivalist and a wild monkey.

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

Trying to survive 21 days completely solo, All-Star survivalist Luke McLaughlin takes on the dangerous badlands of South Africa. Stalked by ferocious lions and hyenas, Luke must get a kill if he has a chance to finish the challenge.

All-star survivalist and wildcard Gary Golding takes on a jungle for the first time completely alone in Belize. Without a partner, Gary forms a bond with a turtle he names Timmy but a deep cut and dangerous infection threaten Gary's challenge.

Desperate for a kill on the African savannah, All-Star survivalist Ryan Holt risks his safety to get in position in for a better shot. A fire in his shelter could take Ryan out of the challenge.

Immediately circled by lions and hyenas, All-star survivalist Lacey Jones is isolated, vulnerable and sleep-deprived as she takes on the African bush. Completely alone, Lacey is pushed to a breaking point where madness awaits on the other side.

Constantly on the run to avoid territorial rhinos, elephants and lions, survivalist Max takes on the punishing African Savannah. Max gets a kill it but it puts his challenge at greater risk, as predators close in to take his hard-earned win.

In the frigid Bulgarian mountains, packs of wolves and territorial boars, stalk all-star survivalist EJ Snyder. Without a partner to protect him and struggling to make fire, EJ becomes a target for the deadly predators.

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.