Riley is going to new heights. He'll hang over the edge of Las Vegas' tallest building to fix the X-Scream, a thrill ride on the Stratosphere. One of the critical safety measures needs replacing, and Riley joins the ride's head of maintenance on the very edge of the track, 800 feet above the ground, to make the fix. Then he'll dangle 500 feet over the side of the Hoover Dam to retrieve trash. Upriver from Niagara Falls, he'll hang over an unstable, overgrown cliff to eliminate loose rocks.