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.

Two survivalists attempt to endure 21 days in Mexico's Devil's Canyon, a notorious hellscape where no one else has managed to make it past one week.

In this 14-day Fan Challenge, an Eagle Scout from Utah and a cannabis cultivator from Chicago meet in the dense, mosquito-infested mangrove of Palomino, Colombia. Things quickly go sideways as their conflicting approaches to survival cause a complete communication breakdown. Will they find a way to cohabitate or will they choose to survive on their own terms?

An expert hunter and an Air Force Vet attempt to survive in Zambia where they are preyed upon by deadly lions, aggressive baboons and elephants.

For the first time ever, two Naked and Afraid crew members, medics Janis and Viktor, attempt to survive 21 days in front of the camera. But faced with swarms of unrelenting insects and a lack of food, this history-making duo is about to get a taste of their own medicine.

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.

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?

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?

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.

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.

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.