Bear Grylls is marooned on a desert island somewhere south of Papua New Guinea. He wades across a shark-infested tidal channel, climbs crumbling volcanic cliffs, leaps over a 100-foot passing drop, and constructs a bamboo windsurfer to make his escape.

Bear Grylls skydives from a wartime cargo plane into Australia's Northern Territory. He will rely on many of the survival skills honed by the aboriginal people who live in Arnhemland to survive in this sweltering landscape where 100,000 crocodiles rule.

Bear faces some of his most dangerous challenges yet, as he attempts to navigates the Canadian Rockies. He avoids a deadly avalanche and traverses a frozen lake, but a glissade proves to be more than he can manage on this occasion.

Bear visits the Caucasus Mountains in the former Soviet Republic of Georgia, where he finds a novel way of crossing a river, avoids becoming a wolf's dinner, and navigates through a featureless marshland.

Bear brings a pair of his show's fans along for a trek through the Canadian Wilderness, where he teaches them how to safely cross glaciers and icy rivers, build a shelter, and find food in the most unlikely places.

In the Mojave Desert, Bear's crew manufactures a sandstorm so that he can demonstrate how to survive its stinging blasts. Also, he must withstand dramatic temperature changes and make it through a flash flood. He also gets up close and personal with some of the desert's most deadly denizens.

Bear's crew give us another behind the scenes peek at how Bear's adventures are filmed.