Two naked survivalists, Shane Lewis and Kim Shelton, are challenged to survive for 21 days in the Costa Rican jungle. While in the lush rainforest, Shane and Kim endure every challenge imaginable, including torrential downpours, illness, a shelter fire, and a deadly encounter with the venomous snake that put the show's producer in a life-threatening situation.

Two survivalists Jonathan Klay and Alison Teal are marooned on a Maldivian island for 21 days. The surfer girl and the former Marine clash when sunstroke and starvation threaten their survival as they try to get through 21 days naked and afraid.