Funnyman Ed Helms ("Vacation") pushes himself to the limit when he joins Bear Grylls high atop the Colorado Mountains. Admittedly fearful of heights, Helms comes face to face with sheer cliffs, crumbling rock and mountain-top perches where the bottom is nowhere in sight. As Bear puts him through the paces with a cringe-worthy dinner menu, Helms manages to conquer his limitations and discover a new side of himself. He also opens up about the trials and tribulations that lead him into a career in comedy.

Bear takes Hollywood bad girl Michelle Rodriguez ("Furious 7") to one of the harshest desert in all of North America- The Red Deserts of Nevada- for a rigorous and scenic adventure. The two make a breathtaking free fall skydive from 10,000 but unexpected high winds push Michelle off course. They navigate down a massive peak and work together to survive as they repel and free climb up and out of the dangerous slot canyons to reach the desert floor. With water in scarce supply, they must come up with clever ways to stay hydrated in the punishing environment. Rodriguez has lived a daring life but learns that Mother Nature shows no mercy and sometimes slow and steady is a better strategy than Fast & Furious.

James Marsden ("X-Men: Days of Future Past") joins Bear on an adventure into the heart of Rattle Snake Canyon Utah, where they helicopter on to one of the highest arches in the area. Once atop the arch, they must repel down the narrow canyons and find a way to get up the towering cliffs on the other side. Along the way, they come face to face with their dinner - a Chuck Walla lizard. As they navigate the dangerous and unpredictable terrain, Marsden shares some insight about his unconventional rise to stardom, starting with his humble beginnings in Oklahoma.