A former Marine sniper and a Mississippi mom try to endure 21 days in a haunted Colombian swamp. But extreme humidity, insects and infection prove more difficult to endure than any legends.

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

An inexperienced survivalist and a wilderness enthusiast take on the unforgiving savanna of Namibia. The harsh conditions quickly take a toll, and the challenge is further complicated when a competitor returns for redemption.

Two survivalists take on the Belize Jungle to survive for 21 days with no food, water or clothes. They must put their skills to the ultimate test to overcome a catastrophic hurricane and predator-filled environment.

A former military man and an optimistic naturalist face humidity, violent storms, caiman, and red-bellied piranha in the Amazon jungle.

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

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.

Former Marine Tim, and Shannon, a stonemason take on armies of stinging red ants and bubbling mud volcanoes on the Caribbean island of Trinidad. Even with this daunting location working against them, their biggest struggle is actually each other.

Two fans, a single mom and an optimistic novice, are selected to take on a special fourteen-day survival challenge on the coast of South Africa.

An ex-marine and a perky Southern girl face constant downpours, cabin fever, threats from predators, lack of sleep and extreme hunger in the Panamanian Jungle.

Jeremy and Melanie continue their challenge in the haunted swamps of Louisiana, enduring threats from predators as they search for food.

A survival-savvy yoga teacher and a custom knife maker tackle the brutal jungle of Colombia. Their primitive survival skills are impressive, but the deadly spiders and tics test both their courage and resilience, threatening to take them down.

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

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

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.

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.

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.