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.

Matt and Honora give the inside scoop on their challenges in Brazil, including their big breakup and Honora's scary blackout.

Extremely hungry with few options, Geoff and Melissa resort to eating a nest of baby birds to sustain their energy.

Forrest isn't drinking the same water as the rest of the group. So how is he staying hydrated? Using bamboo and fire! Watch to learn more!

Paolo and Kristin are using the primitive survival skills they learned before the challenge to get food, water, fire, and more. But now, what they need to practice is communication to work as a team and get on the same page.

How did Jeremy feel about being naked before he stepped into the Naked And Afraid challenge? Find out how he feels in this digital-exclusive casting tape.

David explains the process of starting a fire with a bow drill.

Unable to dry her feet for days, Kaila's skin begins to show signs of trench foot. If left untreated, the condition could lead to gangrene.

Gary and Kim meet in the most awkward fashion upon arrival in Panama.

In this digital-exclusive casting tape, Cassidy discusses how she feels about encountering animals during her Naked And Afraid challenge.

Manu explains the challenges of starting a fire in the extremely humid Panamanian rainforest.

A man named Duck and woman named Sarah meet in the jungle. Will they survive 21 days?

Desperate for protein, the duo works together to catch a swimming snake.

After their Naked And Afraid challenge in the Philippines, Cassidy and Jeremy reflect on the most difficult moments, what their partnership meant, and if they have any regrest.

Early in their 21 Day challenge, Kim and Gary disagree on the importance of sharing body heat through cuddling during the night.

David’s tick bite is getting worse and a medic must be called to clean and drain the wound. The bugs in the Colombian jungle show no mercy to David and Kaila.

After Joe's challenge in Namibia, his legs became swollen, giving him much concern. But his takeaways and new focus for life are inspiring!