Reaching a breaking point, Matt reads a letter from his wife that was hidden inside a knife handle. Overcome with emotion Matt is unsure he can continue the journey.

Even the greatest survivalists in the world are vulnerable to the crippling effects of isolation. Unwilling to give up and more determined than ever, Matt sets out to hunt down the other survivalists.

Matt wakes up to find his camp burning down around him. A fire forces Matt to face the grim reality of having almost been killed. It's his last chance to find XL tribe for his own safety and sanity.

All-stars Jeff Zausch and Laura Zerra, embark on a 60-Day challenge.

Jeff and Laura have a sleepless night due to painful fire ants.

Jeff and Laura get smacked with a dangerous, destructive typhoon that destroys all their progress and tests their mental strength as elite survivalists.

Jeff and Laura explore the jungle to find more resources post-typhoon.

It's Day 21, and Jeff and Laura prepare for the difficult 12-mile journey ahead of them. At the end of the trek awaits a new challenge - to begin a new 40-day XL challenge with 12 strangers.

Jonathan aims to free himself from a stingy situation with little movement.

Jonathan tests his ability to hold his breath under water.

Jonathan Goodwin wages war against the forces of gravity.

Escapologist Jonathan Goodwin tests his escaping ability while spinning. He rides down a hill in an out-of-control locked barrel, gets off a rapidly spinning chair, and takes a wild ride on the Water Wheel of Doom-all in the name of science.

Escapologist Jonathan Goodwin takes the pain and tests his abilities while dealing with projectiles and the science behind them. He gets pummeled with tennis balls flying at 45 mph, high-dives into kiddie pools, and is launched 65 feet in the air.

Jonathan explores the horrifying science and danger of being buried alive.

Jonathan performs dangerous escapes while withstanding impact forces.

Jonathan subjects himself to some fiery abuse while exploring heat.