American Ninja Warrior: Ninja vs Ninja

Flip Rodriguez, and "the Cowboy Ninja", Lance Pekus lead two of the top teams in the fourth week of competition. Another strong group of ninja superstars competes in the fourth qualifying episode - led by Flip Rodriguez and his "Team Ronin". Lance Pekus is captain of "The Wild Bunch". Noah Kaufmann leads "The Think Tank", and Karson Voiles' team is called "Karsonic Boom".