13 Naked and Afraid all stars take on the hunting grounds of apex predators including lions, hyenas and jaguars as they attempt to survive 40 Days and 40 Nights in one of Africa's most unforgiving environments, the Selati River Basin.

12 survivalists enter a punishing African location where tribes in the area lived by a simple principle: banish the weak. As the 40-days begins deadly crocodiles and territorial leopards circle. A survivalist is quickly targeted for banishment.

Learn about the three categories that are factored into a Primitive Survival Rating (PSR): experience, skill, and mental approach. Then, take a look back at survivalists from previous seasons to understand how their final scores were calculated.

With only the gear they can fit into one bag, three couples are dropped in three of the most difficult environments on earth and try to survive the wild, and each other, for three weeks as they make their way back to civilization.

With only the clothes on their backs & the gear in their bag, Jenny and Justin struggle to find their first meal in a week, a raging forest fire forces Mitchell and Jhoanna to flee for their lives; and Max and Linn try to surpass their predecessors.

Mitchell & Johanna struggle through a 16 mile journey to a new camp, only to get caught in a hail storm. Max and Linn battle starvation and each other in the unrelenting jungle. Jenny and Justin’s plan to travel higher into the mountains turns ugly.

In Morocco, Mitchell and Jhoanna endure a massive hailstorm before hunting for their biggest food victory yet. Justin and Jenny finally emerge from a three-day storm in Norway. And in Mexico, Max and Linn experience a huge bounty - and a betrayal.

In Morocco, Mitchell & Jhoanna embark on a trek through higher elevations only to have tempers flare. In Norway, Justin and Jenny try to outrun an Arctic storm. And in Mexico, Max and Linn’s gamble to build a raft to float to civilization backfires.

The survivalists make their final, desperate efforts to reach civilization.

Rescuing stranded climbers with no coordinates is a daunting task.

Jason preps his helicopter for the world's highest landing spot.

Ryan battles the elements racing back to Lukla with sick climbers.

Ryan confronts an uninvited climber trying to hitch a ride at 17,500 feet.

Jason and Siddartha try to save climbers along a treacherous icefall.

Ryan struggles to locate a woman suffering from severe abdominal pains.

Stranded deep in the Amazon, Mykel and Ruth fight to survive the searing heat, poisonous reptiles, and a jungle that conceals its most deadly threats - and the way out.