Stalked by the deadliest animals including lions, spitting cobras and bull sharks, survivalists' every step could bring disaster. To make it 40 Days, they must use their skills to avoid becoming prey while hunting the most dangerous creatures.

Season Finale. Medics closely monitor Jeff's high fever and prepare his evacuation. The others scramble for a 5-mile extraction journey through shark-infested waters. A survivalist pushes too hard leading to a medical emergency on the open sea.

Jeff is called out for his "no hand-outs" survival strategy but refuses to back down. Through a free-wheeling discussion, new interviews, and never-before-seen footage, it's a new look into how the survivalists survived land, sea and each other.

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

12 survivalists take on a 40-day XL challenge in the ferocious, heat-stricken, deadly South African bush, a location so challenging ancient tribes would banish the weak. Now, these survivalists will do the same if someone isn't pulling their weight.

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.