Las Vegas National Finals Night 3

The competition on "American Ninja Warrior" heats up in Las Vegas as twenty-eight competitors move forward and look to conquer stage two at the National Finals. Six dynamic obstacles await them, including three brand new to the course -- "Giant Walk The Plank," "Snap Back" and "Grim Sweeper." Finalists vie for a $1 million prize and the title of "American Ninja Warrior." Matt Iseman and Akbar Gbajabiamila host and Zuri Hall reports from the sidelines.