Season 4

Grylls goes to the Arctic Circle, where he encounters a frozen waterfall, wild reindeer and some of the coldest conditions on the planet.

Grylls wrestles a pig, squeezes through some tight spots, and survives a forest fire in the swamps of Alabama. It is revealed that Grylls broke his shoulder while in Antarctica two months previously.

Grylls demonstrates what it was like for soldiers who had to survive in the jungles of Vietnam, during the Vietnam War.

In Western Texas, Grylls falls to earth from an upturned biplane into the parched Chihuahuan Desert; he traverses deep gorges, locates an oasis and takes on a diamond back rattlesnake.

Grylls returns to the wilderness of Alaska to survive the dangerous terrain of the Last Frontier.

Grylls is on a deserted Panamanian island; he creates fresh water and chooses to use tribal fishing techniques before battling the sea on a makeshift raft. Later in the episode he gives himself an enema in order to stay hydrated on the open seas.

Bear does all his usual acrobatics while suffering through Typhon Parma in China including swinging on a vine, monkey climbing over a gorge and cliff diving.

Grylls takes on Big Sky Country. He paraglides above the Rockies, traverses vast gullies, and makes the most of abandoned debris before making his great escape on a moving train.

Grylls is in a post-disaster urban city scenario and he must survive. His thirst to live and survival techniques modified for a city environment keep him alive in a concrete wasteland in Gdynia, Poland.

Grylls crosses the Sahara desert to the North Africa coast, where he catches an octopus, fashions a shelter out of acacia trees and dines on moths and locusts.