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Nine celebrities pair off with elite ninjas, who help them prepare mentally and physically for the obstacle course.

The heart-racing obstacle course competition series "American Ninja Warrior" premieres its ninth 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. In the first Qualifying Round from Los Angeles competitors must tackle six obstacles, including Cannonball Drop and Battering Ram, which are new this season. "American Ninja Warrior" veterans Kevin Bull and Grant McCartney return for another shot at completing the course.

Indy car driver Conor Daly and Olympic gold medalist Jonathan Horton are among the competitors in San Antonio who tackle two new obstacles: the Spinning Bridge and Sky Hooks.

Competitors tackle six obstacles, including the brand new Rolling Pin and Wingnuts; veteran American Ninja Warrior (2009) fan favorites Jessie Graff, Drew Drechsel and J.J. Woods return; NASCAR drive Ben Kennedy takes on the course for the first time.

Competitors face six challenging obstacles, including the Hang Glider, Broken Pipes and Crank It Up; veterans Lance Pekus, Brandon Mears and Dan Polizzi return; Olympic decathlete Jeremy Taiwo takes on the course.

Competitors tackle Razor's Edge and I-Beam Gap; returning players include the "fantastic four" from last season; Alyssa Beird, Rachel Goldstein, Jesse "Flex" Labreck and Michelle Wamky.

Competitors face three new obstacles called Bouncing Spider, Rail Runner and Ninjago Roll.

The top 30 competitors from the Los Angeles qualifier tackle obstacles, including the Salmon Ladder, Stair Hopper, Swinging Peg Board and Elevator Climb.

Competitors will face the Salmon Ladder, Hourglass Drop, Elevator Climb, and new obstacle Spinball Wizard; veteran ninjas Kacy Esther Catanzaro, Daniel Gil and Brent Steffensen return.

Contestants tackle obstacles including the Salmon Ladder, Circuit Board, Elevator Climb and new obstacle Giant Cubes.

The top 30 competitors from the Cleveland city qualifier compete on one of the world's most challenging obstacle courses.

The top 30 competitors from Kansas City, Mo. vie for a chance to compete in the national finals.

The top 30 competitors from the Denver qualifier compete one more time before the national finals in Las Vegas.

The season's top competitors compete in the national finals in Las Vegas.

National finals continue in Las Vegas, where the season's top competitors tackle a four-stage course.

It's the final night of the "American Ninja Warrior" National Finals, where the season's best Ninjas tackle the last stages of 'Mount Midoriyama'. Competitors who conquered Stage One move on to Stage Two, in hopes of advancing to Stages Three and Four. The finalists vie to win a cash prize of $1 million and the title of "American Ninja Warrior." Matt Iseman and Akbar Gbajabiamila host as Kristine Leahy co-hosts.

Top ninjas, climb, sprint and fly through a special course and supersized obstacles as they compete in crazy feats of strength, skill challenges and a team relay for the ages.

A fifth USA vs. The World special aired for 3 hours on March 11, 2018. This year, Team USA (blue), Team Europe (green) and Team Latin America (yellow) faced a new challenger; Team Asia (red).

Top ninjas, including Drew Drechsel, Jessie Graff, Najee Richardson and Flip Rodriguez, compete in crazy feats of strength, intense skill challenges and a team relay for the ages.