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.

A tough-as-nails MMA fighter and a professional paramedic need to dig deep to attempt to survive 21 days in the brutal caiman infested jungle of Rupunini, 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 unhappy subtropical storms.

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?

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. But when an unexpected cold front sweeps in and the pair are threatened by aggressive lions and rhinos, will they be able to endure?

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. But with temperatures soaring to 130 degrees Fahrenheit, the threesome will need to overcome burns and severe dehydration to survive.

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

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

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

The punishing desert hellscape of Baja, California threatens to take out two more survivalists in this location redemption challenge.

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.