Shane Lewis and Kim Shelton have to survive 21 days in the Costa Rican jungle, where a producer has survived a venomous snake bite.

Survivalists EJ Snyder and Kellie Nightlinger survive in Tanzania's Serengeti Plain, putting their skills to the ultimate test.

Jonathan Klay and Alison Teal are marooned in the Maldives for 21 days and clash with sunburn and starvation.

Clint Jivoin and Laura Zerra have to stay 21 days on a Panamanian island, plagued with sand flies and threatened by snakes.

Survivalists Puma Cabra and Julie Wright have to survive 21 days in Borneo. They battle with sickness, starvation, and wildlife.

Billy Berger and Ky Furneaux survive 21 days in the swamps of Louisiana. They risk attack from deadly snakes and alligators.

All cast (and their family) return with insight and reveal never-before-seen footage from the addictive new show, promising to strip itself down and expose everything you couldn't see before.

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Amanda "AK" Kaye and Tyler Steinle failed to survive in the Amazon rainforest after tapping out, season 1 castaways EJ Snyder and Laura Zerra arrive to complete AK and Tyler's 21 day journey.

Jeff Zausch and Eva Rupert test their survival skills in the harsh desert of Madagascar's Massif D'Isalo. Their camp was badly burned when they attempted to cook snake meat and they barely survived.

Alana Barfield and Keith Busch have a deserted island in Fiji all to themselves. Keith left early on day 11 for seizures; Alana survives alone for full 21 days.

Shannon Thomas and Leonard "Cass" Cassidy are challenged to survive in a flooded jungle of Belize.

Firefighter Fernando Calderon and single mom Samantha Pearson endure relentless storms in a Malaysia rain forest.

Vincent Pinto and Sabrina Mergenthaler face flash floods and heat exhaustion in a Bolivia jungle. Vincent suffered from stomach ache on day 16, and Sabrina suffered severe abdominal pain on day 20, one day short to end the 21 day challenge.

Lindsey Leitelt and Luke McLaughlin challenged in a dense harsh land in Namibia.

Dani Julien and Justin Bullard stranded with starvation and tiny predators in the Bahamas' Andros islands.

Carrie Booze and Tom Touw survive with crocodiles and extreme heat in Cambodia.

Jaclyn McCaffrey and Adam Young survive in Nicaragua for battling with dehydration and freezing temperatures.

Survival coach Tom McElroy and pediatrician Lisa Coray fight with storms and dehydration in Argentina's Yungas forest.

Corinne Kohlen and Chris Fischer are stranded on a deserted beach in Dominica. Corinne tapped out on day 13, and Chris left alone for full 21 days.

Hakim Isler and Phaedra Brothers tackle the high altitude and extreme cold of the Himalayan foothills in northern India. Phaedra battles food poisoning from before her arrival and suffers through bladder and kidney infections.

Joshua Bell and Amanda Leigh face the hot and swampy jungles of southern Nicaragua while armed with only a machete and a roll of duct tape. Joshua leaves early on day 5 for dehydration and Amanda survives all alone for the rest of the 21 days.

Ashley Burns and Michael Jefferson attempt to survive dazzling heat in Botswana. Ashley medically evacuated on day 3 after suffering dizziness, while Michael tapped out on day 12 after hurting his kidney.

Honora Bowen and Matt Strutzel survive hunger and dehydration in Brazil's North Region. Despite Honora passed out from severe heat, Matt completes the challenge all alone.