介绍：史上最极端的生存挑战赛难度越来越大在参加过《原始生活21天》节目后，熟悉这种“裸体挑战”的资深生存主义者尝试在荒凉、危险的环境中生存40天——比之前在节目中挑战的时间还要长19天。为了争夺有限的食物、水和住所，男性和女性都必须挑战人类耐力的极限，同时还要避开对地盘敏感的食肉动物和充满毒液的爬行动物。因为别无选择，竞争者们很快就了解了彼此以及他们周围的环境，他们希望自己的本能、生存技能和勇气能很好地为他们服务。

介绍：《原始生活21天》里好几季里选出几个有争议的或是求生能力强的选手，让他们再度分成四组去非洲挑战赤裸裸求生40天

介绍：跟第一季一样，还是从Naked and Afraid《原始生活21天》好几季里选了12个选手继续扩大求生天数到40天

介绍：Bear drops into the swamps of Florida's Everglades, where at least 60 tourists need to be rescued each year. He trudges through the swamp and shows how to construct shelter, deal with razor-sharp sawgrass, get out of a muddy sinkhole, avoid alligators and rattlesnakes. He eats frogs and cooks a turtle Seminole-style.

介绍：Part 2 of 2. In Patagonia, Bear skins a hare, scales a cliff, tracks a puma, drinks dirty water, and crosses the Perito Moreno glacier, a vast frozen labyrinth of ice caves and crevasses.