Ultimate Ninja Challenge

Profiles of some of the men who choose to live off the grid in the unspoiled wilderness, where dangers like mudslides, falling trees and bears are all part of everyday life.

Viewers go deep into an Alaskan winter to meet six tough and resilient residents as they try to stay one step ahead of storms and man-eating beasts to make it through to spring. The closest neighbor to Sue Aikens is more than 300 miles away. Eric Salitan subsists solely on what he hunts and forages. Chip and Agnes Hailstone catch fish for currency in bartering for supplies, and Andy and Kate Bassich use their pack of sled dogs for transportation.

The famed survivalist takes A-list celebrities on journeys into the wildest locations around the world, forcing the stars to push their bodies and minds to the limit to successfully complete the adventure of a lifetime.

What happens when you put two complete strangers - sans clothes - in some of the most extreme environments on Earth? Each male-female duo is left with no food, no water, no clothes, and only one survival item each as they attempt to survive on their own.

Generations have wondered if they could survive being stranded on a desert island. But how would people cope if they had to do it, for real, and with only themselves to rely on? It's a role reversal for Bear Grylls in this adventure series. Instead of himself attempting to survive harsh conditions in a remote location, Grylls abandons groups of British men and women on remote, uninhabited Pacific islands for a month and more. They will be completely alone, filming themselves, and with only the clothes they're wearing and some basic tools. The island may look like paradise but behind the beaches it can be hell on earth. When stripped of all the luxuries and conveniences of 21st-century living, does modern British man still have the spirit and resources to survive?