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.