AMERICAN NINJA WARRIOR' DEBUTS FIRST-EVER ALL-STAR WEEKEND SPECIAL, FEATURING SUPERSIZED OBSTACLES AND 'TEAM MATT' VS. 'TEAM AKBAR' SHOWDOWN-After a history-making seventh season, "American Ninja Warrior" celebrates with its first-ever All-Star special edition. Hosts Matt Iseman and Akbar Gbajabiamila have each selected their own teams comprised of five competitors, including one rookie and one female competitor. The teams will go head-to-head for bragging rights and the championship trophy. The show features five "supersized" skills and obstacles competitions-a giant peg board, a 40-foot Salmon Ladder, the Flying Shelf Grab, Jump Hang and the "Mega Wall." Kristine Leahy co-hosts.