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Watch American Ninja Warrior Season 9 Episode 4 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Union Station in Kansas City, Missouri hosts the fourth qualifier of 2017. The obstacles featured are the Floating Steps, Hang Glider, Broken Pipes, Crank It Up, Bar Hop, and Warped Wall. Veteran ninjas include rancher Lance Pekus, firefighters Brandon Mears and Dan Polizzi, and daredevil Ethan Swanson, while walk-on Jelani Allen and pizza maker Derrick Pavoni take on the course for the first time.