American Ninja Warrior - Season 4 (2012)

Part 1 of 2. The Midwest regional qualifying round challenges the athletes.

Athletes across the Midwest continue to vie for a chance to take on the World's Most Difficult Obstacle Course. Only 30 will move on to the Midwest regional finals--and this time, there's a brand new obstacle involving hanging curtains.

The top 30 finishers from the Midwest region preliminary round take on an even more challenging course and compete for the chance to move into the national finals in Las Vegas. Comedian Matt Iseman and Olympic gold medalist Jonny Moseley host the heart-racing obstacle course competition series while Angela Sun reports from the sidelines. Watch as competitors tackle the arduous obstacle course in their quest for the 500,000 dollar cash prize and a chance to win the coveted title.

Athletes across the Northeast compete for a chance to take on the World's Most Difficult Obstacle Course. However, only 30 will move on to the Northeast regional finals--and this time, there are two brand new obstacles that have never been introduced at such an early round in the competition! Will two-time veteran Chris Wilczewski prove that staying sober only improves his chances at finishing the course--or will 43-year-old I.T. manager Bill Schlageter show his family and friends that age is just a number? Plus, the wall lift obstacle from last year's finals in Japan...

Athletes across the Northeast continue to compete for a chance to take on the World's Most Difficult Obstacle Course. Only 30 will move on to the Northeast regional finals; so far only eight have defeated all of the obstacles in Miami.

The top 30 finishers from the Northeast region preliminary round take on an even more challenging course to lock a spot in the Vegas finals. Athletes must face three new Miami obstacles: the bungee bridge, jumping bars and the wall lift.

Know what this is about? Be the first one to add a plot.

Aspiring ninjas across the Northwest continue to compete for a chance to tackle the World's Most Difficult Obstacle Course. Only 30 will move on to the Northwest regional finals. See who is strong enough to beat out their competition.

The search continues in Venice Beach as the top thirty from the Northwest preliminary round are narrowed down to fifteen. Athletes tackle eight obstacles and a 45-foot cargo climb to earn a trip to Las Vegas for the national finals.

Athletes from the Midsouth compete for a chance to take on the World's Most Difficult Obstacle Course. Only 30 will move on to the Midsouth regional finals--and this time, there's a punishing new obstacle called the rope junction.

Athletes from across the country meet in Las Vegas to compete in the second half of stage one of the National Finals.

Athletes across the Southeast congregate in Miami, Florida to compete for a chance to take on the World's Most Difficult Obstacle Course. Only 30 will move on to the Southeast regional finals.

Athletes across the Southeast congregate in Miami, Florida to compete for a chance to take on the World's Most Difficult Obstacle Course. Only 30 will move on to the Southeast regional finals.

Athletes across the Southeast continue to compete to take on the World's Most Difficult Obstacle Course.

The top 30 finishers from the Southeast region preliminary round compete for a spot in the finals.

85 athletes take on 23 obstacles on 4 stages in Las Vegas' Mount Midoriyama for a chance to be the first American Ninja Warrior.

Athletes from across the country meet in Las Vegas to compete in the second half of stage one of the National Finals.

The finals continue as competitors take on the challenge of Stage 1 of the World's Most Difficult Obstacle Course.

Competitors continue to take on Stage 1 of the punishing obstacle course in Las Vegas.

As Stage 1 comes to a close, eighteen challengers attempt to clear eight grueling obstacles including the Step Slider, Giant Swing and the Spinning Bridge.

Top finishers tackle the four stage obstacle course modeled after the famed Mount Midoriyama in Japan.

Take a look back at the moments from the Regional Qualifiers and Finals that defined the best season of "American Ninja Warrior" ever. From walk-ons that came out of nowhere like the indomitable Robert Ing and the insanely acrobatic Kevin Bull to seasoned veterans like Drew Dreschel who put up the fastest qualifying time ever, relive the excitement! Plus, who can forget the historical runs by the Mighty Kacy Catanzaro? We have all this and the most heart-breaking failures from hundreds of competitors.

Athletes face the eight obstacles of Stage 1 in Las Vegas.

Part 4 of 6. Athletes face the eight obstacles of Stage 1 in Las Vegas.

Finalists take on a four-stage course. Challenges include a "jumping spider" and a "spinning bridge."

Athletes compete in the finals in Las Vegas.