Competitors from the Midsouth region.

Midwest competitors try to qualify for the national contest.

Part 1 of 2. Thirty competitors attempt the Denver Finals course, which includes two new obstacles: the Floating Stairs and the Pole Grasper.

Competitors from the Midsouth region.

The competitors go to Japan, where they face obstacles on Mt. Midoriyama, in the Season 3 finale. Matt Iseman and Jimmy Smith host, with reports from Alison Haislip.

The top 30 Southeast finishers compete on a more challenging course..

The top 30 Mid-south competitors compete.

Finals begin at Japan's Mount Midoriyama.

Part 1 of 2. A qualifying round in Miami featuring the Utility Pole Slider, the Balance Bridge, the Slider Jump and the Monkey Peg. Contestants include Olympic medalist Dee Dee Trotter.

Finals conclude at Japan's Mount Midoriyama.

Contestants from the Northwest compete.

Contestants from the Northwest compete.

Athletes from the Northeast compete.

Athletes and everyday people compete for a chance to take on the World's Most Difficult Obstacle Course.

The top 30 Northwest finishers compete.

The top 30 finishers from the Southwest qualifying round take on an even more challenging obstacle course to advance to the national finals.

Athletes from the Northeast compete.

Day 2 of boot camp in the California mountains.

Day 4 of boot camp in the California mountains.

Midwest competitors try to qualify for the national contest.

In the last night of the Las Vegas finals, competitors tackle obstacles that include Psycho Chain and Area 51.

Stage 1 of the most-difficult obstacle course continues.

Top finishers challenge Mount Midoriyama.

The qualifying round concludes in Venice Beach, Cal.

People from the Southwest compete for a chance at the world's most difficult obstacle course.

Conclusion. Thirty competitors attempt the Denver Finals course, which includes two new obstacles: the Floating Stairs and the Pole Grasper.

Ultimate challenges including the Spider Flip and the Double Salmon Ladder.

The Top 30 contenders from the Dallas Qualifier compete in the Dallas Finals course, which includes obstacles such as the Salmon Ladder, Swinging Frames, Pole Grasper and Spider Climb.

Part 1 of 2. The Top 30 competitors attempt the Miami Finals course, which includes two new obstacles: the Ledge Jump and the Rolling Steel.

Part 1 of 2. Thirty contestants compete in the Venice Finals. The course features obstacles such as the Salmon Ladder, the Rope Maze, the Cliffhanger and the Spider Climb.

Conclusion. A qualifying round in Denver featuring obstacles such as the Rolling Log, the Rotating Bridge, the Jump Hang Kai and the Grip Hang. Contestants include professional snowboarder Graham Watanabe.

The final qualifying round takes place in Denver and features the never-before-seen Cat Grab and Spikes into Cargo obstacles. Contestants include former competitor Brian Arnold; mixed-martial-arts fighter Michelle Waterson; Bull Bullard of the Harlem Globetrotters; BMX champ Morgan Wade; and fitness blogger Drew Manning.

The National Finals in Vegas continue with stage 2 and beyond.

Competitors face the qualifying round in Venice Beach, Cal.

Conclusion. A qualifying round in Baltimore features obstacles such as the Downhill Jump, Prism Tilt, Swing Jump and Circle Cross.

Athletes and everyday people compete for a chance to take on the World's Most Difficult Obstacle Course.

The Top 30 contenders from the Venice Qualifier compete in the Venice Finals course, which includes obstacles such as the Salmon Ladder, Cannonball Alley, Body Prop and Spider Climb.

Top finishers from the regional finals tackle stage 1 of the four stage finals course in Las Vegas.

Conclusion. Participants compete in the Baltimore finals. The course features 10 obstacles, including the Rumbling Dice and Body Prop.

One hundred competitors attempt the most-difficult obstacle course.

The semi-finals in Venice Beach, Cal.

A qualifying round in Miami featuring the Dancing Stones, the Downhill Pipe Drop and the Mine Field. Contestants include wakeboard champions Rusty Malinoski and Shaun Murray; Olympians Fabien Lefevre and Preston Griffall; and former Las Vegas finalists Joyce Shahboz, Drew Drechsel and David "Flip" Rodriguez.

Competitors face the finals course in Denver.

Stage 1 of the most difficult obstacle course continues.

Day 3 of boot camp in the California mountains.

The top 30 qualifiers compete for a chance to move on to the national finals and tackle a harder course in hope of getting the $50,000 prize.

Top finishers from the regional finals continue to tackle stage 1 of the four stage finals course in Las Vegas.

Conclusion. A qualifying round in Miami featuring the Utility Pole Slider, the Balance Bridge, the Slider Jump and the Monkey Peg. Contestants include Olympic medalist Dee Dee Trotter.

Day 1 of boot camp in the California mountains.

From Las Vegas.

The finals continue in Las Vegas, Nevada, where the remaining finalists take on Stage 1. Those that finish move on to Stage 2.

New obstacles in St. Louis include Rope Junction Into Cargo, Double Tilted Ladder and Crazy Cliffhanger. Competitors include X-Games athlete Kevin Robinson, motorcycle racer Domonic Anderson and Nick Groff ("Ghost Adventures").

People from the Southwest compete for a chance at the world's most difficult obstacle course.

Part 1 of 2. A qualifying round in Baltimore features obstacles such as the Downhill Jump, Prism Tilt, Swing Jump and Circle Cross.

Sean Bryan, Drew Drechsel, Joe Moravsky and Najee Richardson represent Team USA against top athletes from Asia, Europe and Latin America in a battle for worldwide ninja domination.

Drew Drechsel, Jesse Labreck, Mathis "The Kid" Owhadi, Najee Richardson and Barclay Stockett represent Team USA against top athletes from Europe and Australia in a battle for worldwide ninja domination.

Competitors, including Najee Richardson, Joe Moravsky, Allyssa Beird, Captain NBC Jamie Rahn, Chris Wilczewski, face up to six challenging obstacles that include Dangerous Curves and Hazard Cones, which are new to the course this year.

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

The national finals conclude in Las Vegas as the remaining ninjas compete in Stages 3 and 4, and a $1 million winner is crowned as the next American Ninja Warrior.

Competitors including Flip Rodriguez and Adam Rayl face up to 10 obstacles; in a new twist to the City Finals, the two fastest finishers take on the Power Tower for a chance at a safety pass, which provides a second chance at the National Finals.

Season 6 opens with a qualifying round in Venice Beach, Cal., and features obstacles such as the Slack Ladder, the Jumping Bars Into Cargo, and the Cannonball Alley. Contestants include Olympians Susan Francia and Kate Hansen.

The search is on for 10 Americans who will travel to Japan and show that they have the strength, stamina and the guts to make the ultimate ascent to total victory.

It's the final night of the National Finals, where the season's best Ninjas tackle the last stages of "Mount Midoriyama."

Part 1 of 2. A qualifying round in Denver featuring obstacles such as the Rolling Log, the Rotating Bridge, the Jump Hang Kai and the Grip Hang. Contestants include professional snowboarder Graham Watanabe.

The conclusion of the two-part Season 5 opener features a qualifying round in Venice Beach, Cal., with obstacles such as the Frame Slider, Domino Hill, Chain Swing and Flying Nun Chucks.

Competitors face up to 10 obstacles, including the brand new Crazy Clocks, vying for a chance to advance to the national finals.

The finals continue in Las Vegas, where the ninjas face super-sized obstacles in Stages 1 and 2 in timed runs; the ninjas who advance to Stage 2 must complete a six-obstacle course, including new obstacle Hornet's Nest, to advance to Stage 3.

Ninja couples compete relay-style on an extreme obstacle course in teams of two with one being crowned the next American Ninja Warrior Couples Champion.

Twelve elite ninja couples compete together on the world’s most challenging obstacle course with the winners taking home the coveted title of this year’s couple’s champion.

The finals continue in Las Vegas as the remaining ninjas go head-to-head in side-by-side races with the fastest advancing in the competition; athletes face six iconic obstacles including Pole Grasper, Floating Monkey Bars and Piston Plunge.

The qualifying rounds continue in L.A. with ninjas from across the country taking on the world's most challenging obstacle course. The competition is bigger than ever with two new qualifying courses and a chance at the Mega Warped Wall.

Qualifying rounds continue in Las Vegas on the world's most challenging obstacle course; the top 20 athletes of the night advance to the semifinals.

Sixteen elite female ninjas compete on the world's toughest obstacle course with head-to-head races deciding this year's women's champion.

Qualifying rounds continue in Los Angeles on the world's most challenging obstacle course; new obstacle The Cubes makes its debut, and the final spot in the semifinals for each round will be determined by all-new head-to-head runoff races.

In the second round of Qualifying, ninjas including Jesse "Flex" Labreck, Abel Gonzalez, Jamie "Captain NBC" Rahn and Daniel Gil face up to six challenging obstacles, including Ring Chaser and Rib Run, which are new to the course this year.

The search is on for 10 Americans who will travel to Japan and show that they have the strength, stamina and the guts to make the ultimate ascent to total victory.

Qualifying rounds conclude in Las Vegas on the world's most challenging obstacle course; the top 20 athletes of the night advance to the semifinals.

Ninjas face up to 6 challenging obstacles, including the new Weight For It, Ring Chaser, and Rib Run, in addition to fan favorites Shrinking Steps, Slingshot, and the iconic Warped Wall.

Ninjas face up to 10 brutal obstacles, including the dizzying Corkscrew, the Salmon Ladder, and the Dungeon. Ninjas include Jessie Graff, Najee Richardson, Joe Moravsky, and Meagan Martin.

Qualifying rounds begin in Las Vegas on the world's most challenging obstacle course. The competition returns bigger than ever by bringing back trailblazers, record-setters, and fan-favorite competitors from the last 16 seasons.

The National Finals begin in Las Vegas as the remaining competitors compete in Stage 1 for their chance to win $1 million and become the next American Ninja Warrior.

The semifinals continue in Los Angeles, where the competing ninjas face up to six challenging obstacles and race head-to-head for a spot in the national finals.

The finals continue in Las Vegas as the remaining ninjas go head-to-head in high-stakes, side-by-side races with the fastest advancing in the competition; 32 athletes compete in a new bracket-style tournament to determine the next champion.

Qualifying rounds continue in Los Angeles on the world's most challenging obstacle course; new obstacle Kite Surfer makes its debut, and the final spot in the semifinals for each round will be determined by all-new head-to-head runoff races.

The qualifiers continue with ninjas facing up to 6 challenging obstacles, including the new Air Surfer and Pretzel Twist in addition to the iconic Warped Wall.

The finals begin in Las Vegas as the remaining ninjas go head-to-head in side-by-side races with the fastest advancing in the competition; athletes face six iconic obstacles including Shrinking Steps, Swinging Frames and the legendary Salmon Ladder.

The qualifying rounds continue in Los Angeles with ninjas from across the country taking on the world's most challenging obstacle course; competitors as young as 15 return to take on veterans and have a chance to face a taller Mega Warped Wall.

The qualifying rounds in L.A. conclude with ninjas from across the country taking on the world's most challenging obstacle course. The Mega Warped Wall returns and head-to-head runoff races determine the final spot moving forward to Semifinals.

The competition moves into the Finals round with a two-night event to determine this season's champion. 28 top ninjas face up to ten diabolical obstacles including Falling Shelves and Dragonback, which are new to the course this year. The top eight advance to the Power Tower Playoffs to compete head-to-head to determine a winner. Matt Iseman and Akbar Gbajabiamila host and Zuri Hall reports from the sidelines.

The semifinals wrap up in Los Angeles, where the competing ninjas face up to six challenging obstacles and race for a spot in the national finals.

The National Finals continue in Las Vegas as the remaining ninjas compete in Stage 1 for their chance to win $1 million and become the next American Ninja Warrior.

Qualifying rounds continue in Las Vegas on the world's most challenging obstacle course; the top 20 athletes of the night will advance to the semifinals.

Ninjas face up to 10 obstacles, including the new head-spinning Corkscrew and mechanical Clockwork, plus fan favorites such as the Salmon Ladder and the Warped Wall. Ninjas include Daniel Gil, Jesse Labreck, Sandy Zimmerman, Jody Avila, and Grant McCartney.

In the third round of Qualifying, ninjas including Jessie Graff, Najee Richardson, Michelle Warnky and Adam Rayl face up to six challenging obstacles, including the high-flying Beehive, which is new to the course this year.

The qualifying rounds continue in L.A. with ninjas from across the country taking on the world's most challenging obstacle course. The Mega Warped Wall returns and head-to-head runoff races determine the final spot moving forward to Semifinals.

Twelve female ninjas battle across 2 daunting courses with the top 4 finishers advancing to race head-to-head on the Power Tower for the $50,000 prize.

The Semifinals conclude as ninjas face up to 10 obstacles. For Split Decision, ninjas must choose between an upper-body and balance obstacle. The top 2 competitors face off on the Power Tower where the winner earns a Safety Pass for the National Finals.

The qualifying rounds continue in San Antonio, where competitors as young as 15 take on seasoned veterans on the world's most challenging obstacle course; the new Kickboards obstacle makes its debut on the course that ends with the Warped Wall.

The search is on for 10 Americans who will travel to Japan and show that they have the strength, stamina and the guts to make the ultimate ascent to total victory.

The National Finals begin in Las Vegas as the remaining competitors move on to Stage 1 for their chance to win $1 million and become the next American Ninja Warrior.

The national finals continue in Las Vegas as the remaining ninjas compete in Stage 1 for their chance to win $1 million and become the next American Ninja Warrior.

The qualifying rounds continue in San Antonio where Minions have taken over the course and brought the new obstacle Despicaballs; other new obstacles include Shattered Panes and Final Frontier in addition to the iconic Warped Wall.

The qualifiers come to a close with ninjas facing up to 6 challenging obstacles, including the new Tilt A Whirl.

Iconic obstacles get super-sized as top competitors and fan-favorites from Season 10 face off in a high-octane skills competition featuring Wicked Wingnuts, Striding Steps and a record-setting attempt on the four-story Super Salmon Ladder.

Ninjas face up to 6 challenging obstacles, including Off the Hook, Spinning Bridge, and the new Sideways, in addition to the fan favorite Spider Climb and the iconic Warped Wall. Ninjas include Meagan Martin, Joe Moravsky, Tiana Webberley, Michael Torres, and The Cowboy Ninja Lance Pekus.

The semifinals begin in Las Vegas, where the ninjas take on a longer course featuring 10 iconic obstacles from the past; the fastest will advance to the national finals and compete in head-to-head races.

The semifinals continue in Las Vegas, where the ninjas take on a longer course featuring 10 iconic obstacles from the past; the fastest will advance to the national finals and compete in head-to-head races.

Season 13 begins with a new generation of ninjas taking on the course in Tacoma, Wash., at the famed Tacoma Dome. For the first time, competitors as young as 15 compete in round one of Qualifiers where the ninjas face up to six challenging obstacles.

The qualifying rounds begin in L.A. with ninjas from across the country taking on the world’s most challenging obstacle course. Competitors as young as 15 return to take on veterans and will have a chance to face an even taller Mega Warped Wall.

The Semifinals continue from Los Angeles where ninjas face up to 10 challenging obstacles, including new obstacle Drop Zone.

The qualifying rounds continue in San Antonio, where competitors as young as 15 take on seasoned veterans on the world's most challenging obstacle course; the new Piston Plunge obstacle makes its debut on the course that ends with the Warped Wall.

The qualifying rounds conclude in San Antonio with ninjas from across the country taking on the world's most challenging obstacle course; competitors as young as 15 take on seasoned veterans in this first round of competition from the Alamodome.

The Semifinals continue in Los Angeles where ninjas will face up to 10 challenging obstacles, including new obstacle Padlock. For Split Decision, ninjas must choose between an upper body and balance obstacle.

Re-live the best moments from the season so far during this original, jam-packed special chronicling the best runs of this season.

The national finals continue in Las Vegas as the remaining competitors move on to Stages 2 and 3 for their chance to win $1 million and become the next American Ninja Warrior.

The qualifying round in Venice Beach, Cal., ends.

Day 3 of boot camp in the mountains of California.

Qualifying rounds continue in Las Vegas on the world's most challenging obstacle course; the top 20 athletes of the night advance to the semifinals.

In the final city qualifying round, competitors including Jesse Labreck, Grant McCartney, Ethan Swanson, Michelle Warnky, Mike Bernardo, 98 Degrees band member Drew Lachey and more face up to six challenging obstacles, including the new Sling Shot.

Contestants face the qualifying round in Venice Beach, Cal.

The qualifying rounds continue in Los Angeles with ninjas from across the country taking on the world's most challenging obstacle course; competitors as young as 15 return to take on veterans and have a chance to face a taller Mega Warped Wall.

The qualifiers continue with the ninjas facing up to 6 challenging obstacles, including the Shrinking Steps, Weight for It, Split Decision, Tipping Point, V Formation, and the iconic Warped Wall.

Qualifiers continue in Las Vegas with a special "How to Train Your Dragon" episode; dragons Toothless and Stormfly join the ninjas, and the film's star, Mason Thames, joins Matt and Akbar in the booth.

The search is on for 10 Americans who will travel to Japan and show that they have the strength, stamina and the guts to make the ultimate ascent to total victory.

The Qualifiers continue at the Tacoma Dome with a new generation of ninjas taking on the course. For the first time, competitors as young as 15 compete and will face up to six challenging obstacles, including new obstacle Double Down in addition to the iconic Warped Wall.

Day 2 of boot camp.

Stage 1 of the 8 obstacle course will challenge even the most skilled competitors.

The Mile High City hosts the final qualifying round where competitors tackle 3 challenging new obstacles: Bouncing Spider, Rail Runner, and Ninjago Roll. Denver features the return of Ninja veterans Jake Murray, Sam Sann, Meagan Martin, and Brian Arnold.

The top 30 competitors from the Kansas City Qualifier tackle the Kansas City Finals course which includes such obstacles as the Salmon Ladder, Flying Shelf Grab, Body Prop, and Invisible Ladder.

Semifinals from Venice Beach, Cal.

Competitors face the qualifying round in Venice Beach, Cal., in the Season 3 premiere.

The Semifinals begin in Los Angeles where the competing ninjas will face up to 10 challenging obstacles, including new obstacles Wall-to-Wall and the Inverter.

Qualifying rounds begin in San Antonio as the ninjas face four new obstacles plus the Warped Wall.

Ten ninja families compete relay-style on a six-obstacle course in teams consisting of three family members; the top four teams face off in a Power Tower tournament, but only one family will be crowned American Ninja Warrior Family Champions.