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.

World-renowned survivalist Bear Grylls ("Get Out Alive with Bear Grylls," "Man vs. Wild") spends two days with actor Channing Tatum ("22 Jump Street") traveling through the tough terrain of Yosemite National Park in California. As they encounter challenging obstacles, Channing approaches his adventure with the attitude that if Bear can do it, then he can too..or he'll die trying.

World-renowned survivalist Bear Grylls ("Get Out Alive with Bear Grylls," "Man vs. Wild") takes Tom Arnold ("Sons of Anarchy") through the unpredictable coastal mountains of Oregon, taking on steep terrain, river crossings and oceanside cliffs. Arnold attempts to channel the courage and determination from his weight-loss struggle in order to tackle a journey that takes him to the brink of mental and physical exhaustion.