Three of the strongest Alone participants take on a bushcraft challenge devised by one of their own--build an Earth Shelter in three days using just a few surprise tools. It's a showdown for bragging rights between Jordan Jonas (Season 6 Winner), Am s Rodriguez (Season 7) and Lucas Miller (Season 1). Who will build the best shelter and win?

Three former Alone participants take on a difficult challenge they've never tackled before - build a Bushcraft Bridge in three days using just a few simple tools. Lucas Miller (season 1), Callie North (Season 3) and Britt Ahart (Seasons 3 & 5) will compete to show off their skills.

Building a wilderness survival shelter is far from simple, but it's even tougher to make it bone-dry when it rains and smoke-free when a fire is lit. That's the challenge facing former Alone participants Clay Hayes (Season 8 Winner), Jordan Jonas (Season 6 Winner) and Am s Rodriguez (Season 7). With limited tools and just a few days, will they be up to the task? Only one can take home the win.

This week's challengers tackle a complicated build--crafting a working oven from all natural materials, like sand, wood and water. Luckily, Callie North (Season 3), Clay Hayes (Season 8) and Am s Rodriguez (Season 7) are all highly-skilled former Alone participants. Can they complete what's normally a weeks-long build in just 3 days and with limited tools? Survival expert Britt Ahart (Seasons 3 & 5) will judge the results.

A 12-foot-high elevated shelter that's safe from predators, in just three days, with only three tools? That's the tall challenge in store for former Alone participants Joel van der Loon (Season 7), Jordan Jonas (Season 6 Winner) and Clay Hayes (Season 8 Winner).