Bear Grylls is abandoning 13 ordinary British men on a remote, uninhabited island in the pacific. Can they survive for a month completely alone? When stripped of all the luxuries and conveniences, does a modern man still have skills to survive?

In this episode, 48 hours since their last meal and hunger grips the group as the harsh reality of island life is dawning. The race is on to bring food back to camp before they become too weak to hunt.

The men are radically losing weight, existing on a paltry average of just 300 calories a day. With their very survival hanging in the balance, the castaways lose patience with those they feel are not pulling their weight.

Three weeks in and the group is barely getting by on a meager diet of snails and coconuts. Willing to take ever-greater risks for food, Mike and Chris battle with treacherous tides in a desperate search for much-needed fruit.

In this final episode, the men enter their fourth week of living on the island and the group is hungry and divided. And without unity, the men are not gathering enough food to survive.

When Bear returns to the Island to see the results of his experiment, he gets to see first hand how the men have been living for the past four weeks. He tours the camp reflects with them men on their personal approaches to surviving on The Island.