Top finishers from the regional rounds advance to the final "Las Vegas" round, which featured the ultimate challenge - a stunning four-stage obstacle course modeled after the famed "Mount Midoriyama" in Japan. Matt Iseman hosts the heart-racing competition show in which competitors take on various "finals round" stages as they vie to move onto the final stage 4 in their quest for a $500,000 cash prize and the title of American Ninja Warrior.

Top finishers from the regional rounds advance to the final "Las Vegas" round, which featured the ultimate challenge - a stunning four-stage obstacle course modeled after the famed "Mount Midoriyama" in Japan. Matt Iseman hosts the heart-racing competition show in which competitors take on various "finals round" stages as they vie to move onto the final stage 4 in their quest for a $500,000 cash prize and the title of American Ninja Warrior.

Comedian Matt Iseman hosts the heart-racing obstacle course competition series "American Ninja Warrior." Top finishers from the preliminary rounds take on a challenging obstacle course to compete for the chance to move onto the finals round in Las Vegas and the chance to win $500,000. Competitors range from trained athletes to everyday Americans including schoolteachers, police officers, moms and even granddads.

Comedian Matt Iseman hosts the heart-racing obstacle course competition series "American Ninja Warrior." Top finishers from the preliminary rounds take on a challenging obstacle course to compete for the chance to move onto the finals round in Las Vegas and the chance to win $500,000. Competitors range from trained athletes to everyday Americans including schoolteachers, police officers, moms and even granddads.

Comedian Matt Iseman hosts the heart-racing obstacle course competition series "American Ninja Warrior." Top finishers from the preliminary rounds take on a challenging obstacle course to compete for the chance to move onto the finals round in Las Vegas and the chance to win $500,000. Competitors range from trained athletes to everyday Americans including schoolteachers, police officers, moms and even granddads.

Top finishers from the preliminary rounds take on a challenging obstacle course to compete for the chance to move onto the finals round in Las Vegas and the chance to win $500,000. Competitors range from trained athletes to everyday Americans including schoolteachers, police officers, moms and even granddads.

." Top finishers from the preliminary rounds take on a challenging obstacle course to compete for the chance to move onto the finals round in Las Vegas and the chance to win $500,000. Competitors range from trained athletes to everyday Americans including schoolteachers, police officers, moms and even granddads.

Top finishers from the preliminary rounds take on a challenging obstacle course to compete for the chance to move onto the finals round in Las Vegas and the chance to win $500,000. Competitors range from trained athletes to everyday Americans including schoolteachers, police officers, moms and even granddads.

Picking up from last night's episode on G4, top finishers from the NBC regional finals tackle the ultimate challenge - a four stage course modeled after the famed 'Mount Midoriyama' course in Japan. Tonight's competitors take on Stage 1, a punishing 8 obstacle course that includes a Jumping Spider, Half Pipe Attack and Spinning Bridge. Only the competitors skilled enough to conquer all 8 obstacles will move onto Stage 2. Comedian Matt Iseman and Olympic Gold Medalist Jonny Moseley host and Angela Sun ("Yahoo! Sports Minute") reports from the sidelines as the competitors continue in their quest for the $500,000 cash prize and the chance to win the first "American Ninja Warrior" title.

The top competitors of the Southwest Region qualifiers compete for a spot in the regional finals.