Charlie Frattini

Twelve brave souls take on their first XL challenge in the Colombian Badlands. Survivalists must battle disease-carrying insects, scorching heat, six-foot caiman and stalking jaguars. In this unprecedented challenge, they must trek 40 miles in 40 days.

Facing an unprecedented two-day extraction, the final eight survivalists hunt, fish, and trap potential food. An emergency overnight in the jungle causes fears and tensions to flare. Malorie's struggles may cause medics to step in and end her challenge.

Adam, Heather and Sam score a massive protein win, but the trek through Colombia's badlands puts the team at risk. Chris battles a mystery illness. As tension rises, Nathan reveals a secret to his partners. The Proving Grounds send a survivalist home.

The remaining survivalists join forces. When the group splinters to hunt resources, it leads to a big protein win but creates tension between Lynsey and Terra. Nathan uses a primitive cooking method to maximize the meat. Adam and Heather clear the air.

A newly formed tribe quickly works together to stalk and kill a caiman. The pressure to trek 40 miles to extraction pushes two teams to make risky migrations. A survivalist is on the brink when medics discover parasites in their digestive system.