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. On Running Wild with Bear Grylls: The Challenge, Bear Grylls is taking it up a level by teaching his celebrity guests essential survival skills that they'll have to master and then prove they can use in a high-stress situation.