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, Heather and Sam score a protein win, but the trek through Colombia's badlands puts the team at risk; Chris battles a mystery illness; Nathan reveals a secret to his partners; the Proving Grounds send a survivalist home.
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; they must trek 40 miles in 40 days.
Far from extraction, Kaiela leads her team on a punishing trek that puts her challenge at risk; Adam and Heather's smoldering tension makes the new camp choose sides; desperate for protein, a risky survival choice pushes Heather to her breaking point.
A newly-formed tribe quickly works together to stalk and kill a caiman; the pressure to trek forty miles to extraction pushes two teams to make risky migrations; a survivalist is on the brink when medics discover parasites in their digestive system.
