Running Wild with Bear Grylls: The Challenge

Bear Grylls takes actor, activist and author Russell Brand on an adventure down the jagged coast of a secluded Scottish isle in search of 16th-century castle ruins to shelter in. Along the way, Bear teaches the brash and bombastic Brand survival skills that dredge up a long-forgotten but highly charged fear he must overcome to reach his extraction.

Bear Grylls takes singer-songwriter, actor and designer Rita Ora on an adventure in the Valley of Fire. The journey launches into high-octane action with the pair skydiving from 10,000 feet, plunging them into the desolate terrain. Bear teaches Rita how to navigate, find water, and rock climb, as he prepares her to earn her extraction on day two.

Bear Grylls takes actor, musician and "Hamilton" star Daveed Diggs on an adventure in the Great Basin Desert to teach him to track, climb and eat whatever the desert provides. On day two, Daveed must fly solo and put his skills to the test by using what he's learned to find Bear and earn his extraction.

Bear Grylls invites "She-Hulk" and "Orphan Black" star Tatiana Maslany on a journey across Wyoming's Laramie Mountains. Tatiana admits that she's fearless on the screen, but she can't tap into that same bravery in the real world. So, Bear challenges Tatiana to conquer massive cliff rappels, menacingly icy cliffs, and a zero-degree cold shock to the body to help her overcome her fears.