Ashton Kutcher Couldn't See, Hear or Walk From Autoimmune Disorder (EXCLUSIVE)

Ashton Kutcher is opening up about a medical disorder that left him without the ability to hear, see or walk. In Access Hollywood's exclusive look at an upcoming episode of National Geographic's "Running Wild with Bear Grylls: The Challenge," the actor speaks about an autoimmune disorder that he developed. "Like two years ago I had this weird, super rare form of vasculitis, that like knocked out my vision, it knocked out my hearing, it knocked out like all my equilibrium," Ashton revealed. His episode of "Running Wild with Bear Grylls: The Challenge" airs Monday on National Geographic.