Charlie Frattini

The Peruvian Amazon's aggressive piranha, venomous fer de lance and even poisonous plants test 12 survivalists. XL rookies look to last 40 days while vets try to make 60 and become Legends. Four survivalists will be gone in the first four days.

Twelve brave souls take on their first XL challenge in the Colombian Badlands; survivalists must battle disease-carrying insects, scorching heat, six-foot caiman and stalking jaguars; they must trek 40 miles in 40 days.

Kate is slammed by Africa's wrath; a hungry Bulent gets a major score with his bare hands.

n a brand-new, bigger-than-ever challenge, 14 of Naked and Afraid's best go head-to-head. Big skills and bigger egos clash as Bare-Handed Killer Bulent, survival expert Ky, as well as previous competitors Dan, Gary and Jeff immediately stake their claim.

12 elite survivalists take on the sub-freezing Rocky Mountains of Montana.

An unlikely alliance scores the challenge's first big-game kill; Suzänne risks her survival.