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Eight survivalists tackle 21 days in locations across the globe all alone.

Two new survivalists begin their 21-day solo challenge.

Shanika and James begin their 21-day solo challenge.

Cheeny stalks another giant catfish, a Fer de Lance gets the best of Kaila and Fernando battles his own doubts.

A painful injury jeopardizes Shanika's challenge while Fernando's persistence brings him a huge win.

Terra, Jamie, and James attempt to endure the last days of the challenge and their brutal extractions.

Hypothermic, starving and dehydrated after surviving 21 days solo, Cheeny, Kaila and Fernando brace for their difficult extractions.