Watch American Ninja Warrior season 8 episode 1 online. The heart-racing obstacle course competition series “American Ninja Warrior” premieres for its eighth season this summer. The action-packed series follows competitors as they tackle the world’s most difficult obstacle courses in qualifying and finals rounds across the country. Those that successfully complete the courses in each city will move onto the national finals round in Las Vegas and compete for a $1,000,000 prize. Four of the six obstacles on the Los Angeles course will be new to “American Ninja Warrior.” For the first time, competitors will face the Floating Steps, Tic Toc, Escalator and Ring Jump. Veteran Ninjas Kevin Bull, Jessie Graff and Grant McCartney return for another shot at completing the course. Matt Iseman and Akbar Gbajabiamila return as hosts as Kristine Leahy co-hosts.