"American Ninja Warrior" celebrates the upcoming season with its second annual "American Ninja Warrior All-Stars" two-hour special. Hosts Matt Iseman and Akbar Gbajabiamila along with co-host Kristine Leahy have each selected their dream teams, which will go head-to head on some of the show's most popular obstacles. Each of the teams is comprised of three competitors including Las Vegas finalists Jessie Graff, Grant McCartney, and Chris Wilczewski. The teams will go head-to-head for bragging rights and the championship trophy. This nail-biting special episode also features five "supersized" skills and obstacles competitions, including a breathtaking Endless Invisible Climb and a Super Salmon Ladder.