After only a short time in the wild, the men find that extreme isolation is beginning to take its toll. A survivalist undertakes a massive cabin project, one man loses his most important tool and another is charged by a large predator leaving him to fend for his life.

As the days pass, the remaining survivalists show signs of cracking. One man battles isolation as another breaks down after missing his daughters 4th birthday. But it's the real dangers of the environment that could spell the end for one participant when he finds himself stalked by a cougar.

After several days, the participants attempt to acclimate to their new environment and make order out of chaos. One survivalist proves incredibly skillful and finds enormous success scavenging and hunting for food. Meanwhile, doubts emerge for others as debilitating hunger sets in.

After a week on Vancouver Island, several of the participants are finding success in their new environment. But while some work in harmony with the wilderness, others battle against it and careless mistakes threaten to send two people home.

The remaining participants dig in for the long haul as they begin building their shelters. While some flourish, others fail and one is threatened by an unwanted visitor in the night.

A lack of food forces the remaining participants to get creative. One survivalist devises an ingenious method for getting protein while another battles Patagonia's wiliest predator.

As their teammates attempt to set up camp, the hikers find that Vancouver Island's terrain is even more punishing when on the move. The island beats one pair into submission, while another grapples with a devastating accident.

On Vancouver Island, a seriously injured participant weighs the risks of seeking medical help and sacrificing his shot at $500,000. Danger awaits all participants as predators continue to stalk the island's newest inhabitants.

The survivalists begin to face external and internal threats as they work to secure food and complete their shelters. One participant comes face-to-face with one of Mongolia's deadliest predators, while another fights to overcome a debilitating health issue.

Mongolia shows how devastating its climate can be as a monstrous storm assails the remaining survivalists. The participants are forced into their shelters and can only hope they'll hold up to the fierce wind, rain and lightning.