World-renowned survivalist Bear Grylls ("Get Out Alive with Bear Grylls," "Man vs. Wild") leads Zac Efron ("Neighbors") on a non-stop extreme survival journey into the Northeast Appalachian mountain range wilderness. With Bear's help, Zac challenges himself physically as well as mentally on an awe-inspiring journey he could never have imagined.

World-renowned survivalist Bear Grylls ("Get Out Alive with Bear Grylls," "Man vs. Wild") meets actor Ben Stiller ("Secret Life of Walter Mitty") on the rugged mountains of the Isle of Skye in Northern Scotland to go on a once in a lifetime adventure. As they explore their surroundings Bear tests Ben's limits in an effort to see how he measures up to the unpredictable and unforgiving challenges of Mother Nature.