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.

After a rough challenge, Duck does not recommend sleeping naked in the jungle.

Gary's time spent around the world in extreme conditions has prepared him for the Naked And Afraid challenge. Learn more about his past from his casting tape.

Vincent and Sabrina meet for the first time, naked in the Bolivian jungle as they begin their 21 day survival challenge.

Laura and Nicklas meet in the Australian Outback completely naked. After a few jokes and a hug, they are ready to begin the survival challenge.

Sabrina turns to her new "friend" Mushroom Man in her partner's absence. A true castaway moment.

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

Fire ants, mosquitoes, ticks, oh my! One common experience for many of the survivalists is being eaten alive by tiny critters.

Robin and Brandon have diffefrent skills -- and different comfort levels with nudity. But when they meet for the first time in Cayo Venado, Mexico, they're both excited and ready for their 21-Day challenge.

In Annie's casting tape, she explains how she has lived off the land her whole life. With this experience with her family, she's ready to take on the Naked And Afraid challenge.

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

The ladies of Naked and Afraid were worried about waking up next to more than just fire wood. Hear the guys' and gals' perspectives on this Bares All clip!

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

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

After Laura and Nicklas reach a new level in their fighting, they decide to split up their camp and efforts as a survival partnership.

The naked survivalists look back at all of the gross food they ate during their 21-day survival challenge.

Samantha suffers horribly as her body is covered by hundreds of bug bites while attempting to survive naked and afraid in Malaysia for 21 days.