Overview: Two brothers, Timmy O'Neill, a pro climber, and Sean O'Neill, who is paralyzed from the waist down, push the limits of adaptive climbing, conquering the 3,000-foot face of El Capitan. Then it's on to the Ruth Gorge of Alaska, where they cross a treacherous glacier to climb a remote rock wall. In a storm-stricken land that would challenge even able-bodied climbers, Timmy and Sean face their greatest challenge yet.