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.

Sam gets a tick bite in the worst spot imaginable. When Terra encourages Lynsey to quit, emotions erupt. Desperate for protection, Adam and Heather start a grueling shelter rebuild. Malorie stalks a massive caiman. The Badlands send a survivalist home.