Two foreigners try to become the first survivalists to endure 21 days on U.S soil. But rattlesnakes, unfamiliar terrain and plummeting temperatures threaten to send them back across the pond.

Lilly from Austria and Sam from the UK team up to do battle with the New Mexico wilderness.

Justin, a professional fighter, and Kami, a first responder attempt to survive the wetlands of Guyana.

A professional backpacker and an experienced hunter attempt to survive 21 days without their high-end gear in a swampy Argentine savanna teeming with mosquitoes, aggressive bees and violent subtropical storms.

Argentina provides the backdrop for survivalists Malorie and Patrick as they contend with an unforgiving jungle.

Four male survivalists who tapped in previous challenges seek redemption in South Africa. Humbled by their past failures, can they make it to 21 days and triumph as a tribe?

Limpopo, South Africa threatens to keep four returning survivalists from the redemption they desperately seek.

Jaclin, a paralegal, and Michael, a fishing boat captain, take on 21 days in the mighty Kalahari desert of South Africa, one of the largest stretches of sand in the world.

Heather, a pro-angler from Texas, Sean, son to the late astronaut, William McCool, and Dallas, a reformed ex-con, take on 21 days in the searing heat of Limpokwena, South Africa.

Two Naked and Afraid crew members try their hand at surviving in the wild.

The savanna of Guyana provides two Naked and Afraid crew members a chance to experience the show from the survivalists' perspective.

An expert bow-hunter and Air Force Vet hope to survive in deadly Zambia.

Joe and Candice struggle to survive the thorns and wildlife of the Luanga Valley, Zambia.

Omar and Raven attempt a 14 day fan challenge in Colombia, discovering what's worse: relentless mosquitos or personality conflicts?

Rachel, a survivalist from Naked and Afraid of Love and Na'im, an outdoorsman from Colorado, take on 21 days in the rugged wilderness of Argentina. But freezing nighttime temperatures might push the pair to their limits.