It didn't take long for the popular Ninja Warrior concept to make its way out of Japan and hit the world stage, but now thousands of hopefuls will audition in Denver for the chance to appear on the American Ninja Warrior while still thousands more wait to audition for “X-Factor,” also set to appear in the city.

Thousands will come — armed with everything from a lucky song to a favorite pair of sneakers — but only a few will move one step closer to becoming the next ultimate athlete or superstar performer.

Athletes, singers, acrobats and everything in between have begun to arrive in Denver this week, hoping to earn a chance to shine on reality TV shows.

Traffic was stalled Tuesday morning as thousands made their way to the Denver Coliseum to audition for Fox's talent show "X Factor." A few miles south, Civic Center was being transformed into an obstacle course designed to test the agility and strength of competitors hoping to appear on NBC's summer series "American Ninja Warrior."

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