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.

Five days into the Naked And Afraid challenge, Julio claims he has no hunger. At the same time, Tawny experiences hunger pains and continues to hunt for the team.

During Kim's casting tape for Naked And Afraid, she describes what her ideal partner would be to balance her personality during the 21 Day challenge.

Sarah from the "Lost At Sea" challenge in Exumas checks in from her sailboat in Hawaii. Still positive and upbeat, Sarah continues to adventure the world whether it be by land of sea.

Keith Busch and Alana Barfield meet for the first time, naked on a remote Fijian island. Will they have what it takes to survive naked and afraid for 21 days?

The nights are long and cold during the 21-Day survival challenge. One of the best ways to combat the elements is to snuggle, but not all partners are comfortable.

Forget pirates and voodoo curses, the scariest thing about Louisiana might just be the mosquitos. Will Michelle be able to make it through 21 days of biting torture?

Tensions flare as resources are put towards building chairs instead of finding food.

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

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

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

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

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.

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

Do you believe in demons? Melissa regales Jeremy with the story of the fateful night that she encountered an incubus.

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