Host Bear Grylls parachutes alone into a remote area of the Rocky Mountains equipped with only the clothes on his back.

Bear Grylls is dropped by a helicopter into the Moab Desert in Utah in almost 45 degree temperatures, with nothing but a knife, a canteen, and a flint. He battles dehydration by soaking his t-shirt in urine, and eats two raven eggs, one raw. Lastly, he demonstrates how to escape from quicksand before swimming across the Colorado River. He also explains how to use the flow of rivers as tools to find civilization.

Grylls parachutes into a Costa Rican rainforest in the Osa Peninsula, with only his knife and a canteen. He's careful about the water he drinks, but gets violently ill anyway. He climbs down a waterfall using a vine, and floats down a river to the ocean on a raft he crafts out of balsawood to demonstrate how someone lost in the jungle can make it to civilization. He encounters snakes, mosquitoes and dangerous river currents.ve swamps.

Grylls is dropped in the Chugach Mountains in Alaska, with skis and his usual gear. He demonstrates Glissading as he traverses snow and glaciers, and climbs down a 200ft (61m) waterfall. He catches a salmon, which he eats raw, and finds a skiff from an abandoned lodge. The skiff sinks, but he reaches the shore and is spotted by a ship.

Grylls is dropped by helicopter at the top of Mount Kilauea. Made up of an expanse of solidified lava which stretches for 33,000 acres, this environment is one of the world's most inhospitable. He first traverses lava fields, which catch his boots on fire, then heads into the jungles of Hawaii. Grylls uses a kukui nut torch to explore a lava tube and finds water, then uses smoke to placate a bee hive to get honey. Ultimately, he finds the sea (and people) by following seabirds.

Grylls parachutes into the Sierra Nevadas, simulating the situation of the hundreds of hikers who become stranded there each year. Equipped with a knife and a canteen, Grylls travels through the alpine, woodland and chaparral areas of the mountains. He unsuccessfully tries to tame a wild horse, and eats a live snake. Using techniques gleaned from the Mono Indians, he brushes his teeth with a manzanita leaf. Most of the ground he covers is traversed by river, using a raft held together by grape vine.

Grylls parachutes into the Sierra Nevadas, simulating the situation of the hundreds of hikers who become stranded there each year. Equipped with a knife and a canteen, Grylls travels through the alpine, woodland and chaparral areas of the mountains. He unsuccessfully tries to tame a wild horse, and eats a live snake. Using techniques gleaned from the Mono Indians, he brushes his teeth with a manzanita leaf. Most of the ground he covers is traversed by river, using a raft held together by grape vine.

Grylls parachutes into the French Alps with a knife, a canteen, a cup and a flint, taking the parachute with him. He demonstrates how to survive falling into a frozen lake, how to build a snow shelter, and how to use a self arresting device to stop from plummeting into a crevasse. He also eats maggots and uses them to catch a trout. He performs a Tyrolean traverse and makes himself a pair of snow shoes out of young trees and parachute lines.

Grylls is kicked out by helicopter into the water near a deserted island in the Pacific Ocean. He demonstrates long distance swimming, shelter building and coconut harvesting. Grylls builds a bamboo raft to look for ships, and is surrounded by tiger sharks. He fishes off his raft using a fish bone hook, and shows how to signal a ship using the reflection produced by his polished knife.