In desperate need of protein, Fernando attempts to catch a fish with his bare hands.

Cass and Shannon meet for the first time - naked in Belize - as they begin their 21-day survival challenge.

Cass and Shannon run across an ancient cave system during their 21-day survival challenge in Belize.

Will Jeff stray from his deep religious beliefs in order to stay warm at night, or will he and Eva continue to sleep separately in the cave of black widows?

Vincent's frustrations with Sabrina begin to boil over. Will the pair make it through 21 days together naked and afraid in Bolivia?

Fernando Calderon and Samantha Pearson meet for the first time - naked - in Malaysia.

Water is scarce and the hot sun makes energy levels difficult to maintain.

The mosquitoes in the Amazon jungle are relentless. AK and Tyler have bug bites everywhere - and nakedness takes its toll.

Leeches invade the private parts of these two Naked and Afraid survivalists in Malaysia.

Keith goes after a deadly sea snake even though Alana thinks it is a completely unnecessary risk.

Desperate for drinkable water, Keith and Alana attempt to purify water using hot rocks.

Jeff and Eva arrive in Madagascar and strip down for their 21-day naked survival challenge.

Jeff has a personal vendetta against a lizard in Madagascar. When he finally captures it, what he does next will shock you.

On the first night of their 21-day survival challenge, the castaways are pummeled with rain, soaking them to the core.

The castaways spot a snake under a rock. Will it be their dinner, or will they be its next prey?

While squishing through the muddy jungle, a naked castaway spots a snake and needs her partner's aid.

Luke and Lindsey meet on day 1 of their Naked and Afraid survival challenge. Will they have what it takes to survive?

This is real. This is legit. And these castaways are running on empty.

Zack makes good use of his selfie camera and lets out a goofy side during his last week of the survival challenge!

The pressure of building a shelter is too much for these strong-willed survivalists, but trust and unity are essential in order to make it to the end.

Billy demonstrates how to transform a broken piece of glass into a lethal spear head, creating a weapon better-suited for hunting than a simple wooden spear.

From parrot heads to turtle testicles, the survivalists have eaten it all. Relive the craziest eating moments from Naked and Afraid history.

Billy and Ky meet each other for the first time, just before their 21-day naked survival challenge in the swamps of Louisiana.

Using cordage to make nets can make all kinds of useful items, like a hammock or clothing. Watch Paolo learn the ropes!

Billy and Ky are having a rough time between sleep deprivation, poor weather and relentless mosquitos, but Ky is getting tired of Billy's whining.

Desperate for protein a few days into the Naked And Afraid challenge, Jake resorts to swallowing grubs whole.

Angela and Darrin sit down with Naked And Afraid Executive Producer Joseph Boyle to discuss 21 days of clashing personalities, animal invasions, and more.

Learn step-by-step how to make a loincloth from scratch using leftover nutria hide.

Thorns all around make a jungle walk hellish. But with handcrafted cord survival sandals, Darrin and Angela can venture into the jungle to find necessary food.

Get a sneak peek of the Naked and Afraid finale as Alison Teal shows off her MacGyver skills - crafting clothing, baskets and more from her jungle resources.

Time for a hatchet haircut! Lindsey sacrifices her hair as cordage for a bow drill when she and her partner Luke become desperate for fire.

Kim and Gary reflect on their 21 Day challenge in Panama. Watch as they divulge their impressions of each other, toughest moments, and whether or not they'd consider taking on the challenge again.