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.

For an unprecedented 60-day survival challenge, Naked and Afraid survivalists Laura Zerra and Jeff Zausch, take on a punishing Philippine jungle. To make it all the way, they must be willing to become savage.

After a sleepless night due to painful fire ants, Jeff and Laura must improve their drinking water situation. Another priority will be to secure substantial protein, besides snails, if they want to make it to Day 60.

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

After losing their shelter and supplies during a typhoon, Jeff and Laura explore the jungle to find more resources, a turning point in their 60-day challenge.

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.

Grady and Josh confront the dangers of Croatia's Velebit Mountain.

Grady and Josh battle snakes, mosquitoes and dehydration in Nicaragua.

Grady and Josh face punishing conditions in Bulgaria's Rila Mountains.

Shipwrecked, Grady and Josh seek solutions for food, shelter and water.

Stranded in the Peruvian Andes, Grady and Josh battle altitude sickness.

Experts face Wyoming’s Bighorn Mountains in the dead of a brutal winter.

Grady and Bo are dropped into separate locations of a Colombian jungle.

Innovative survival tricks help acquire food, shelter, fire and water.