Now that The Undertaker's famous undefeated streak has ended, we can now look back it in its entirety. In the days leading up to WrestleMania 31, we will take a look back at every memorable chapter of the feat that can never be duplicated. Here's a look at what became the holy grail of professional wrestling.

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The Undertaker vs. Randy Orton (13-0)

WrestleMania 21 | Staples Center — Los Angeles | April 3, 2005

Attendance: 20,193

Match length: 14:14

Back at WrestleMania X-Seven in 2001, hall-of-fame play-by-play announcer Jim Ross mentioned that The Undertaker was undefeated at WrestleMania.

Despite the statistic being rather astonishing, the streak didn't take on a life of its own right after that.

In 2005, however, it did and it took center stage at WrestleMania 21.

Randy Orton had made quite the name for himself as the Legend Killer, where he would take out any legendary wrestler that crossed his path. He vanquished every legend he encountered, so naturally, there would come a time where he cross paths with the biggest, baddest legend available at that point: The Undertaker.

Orton didn't want to just beat The Undertaker. That wasn't enough for him. He became the first man that wanted to end The Undertaker's lengthy winning streak at WrestleMania. That was his sole focus. He saw as yet another feather in his cap.

The match was an attraction not only because of the streak but because of the contrast between the two wrestlers. The Undertaker was creeping up on two decades in the wrestling business whereas Orton was just two days removed from his 25th birthday.

The Undertaker was always stoic and dark. By contrast, Orton was loud, brash and fearless, but to a fault. But Orton didn't attack The Undertaker alone. He enlisted the help of his father Bob Orton Jr., who had just received induction into the WWE Hall of Fame.

The elder Orton came into play during the match as he hit The Undertaker with his patented cast in an effort to help his son end the streak, but it was to no avail. The Undertaker eventually fought off the Ortons and extended the streak in dramatic fashion.

Not only was the story of the match captivating, the match itself was, too. People were so into the match, some people in Los Angeles were actually rooting for Orton to win the so that he could end the streak. I'm certain those people felt a lot different after a fateful night in New Orleans almost a decade later.

In hindsight, this match proved to be the catalyst in making the streak into what it eventually became, the main attraction to WrestleMania every single year. Its significance cannot be understated.