We all knew we were witnessing something special on March 18, 2002 when "The Next Big Thing" crashed the ring and decimated three wrestlers, under the supervision of none other than Paul Heyman.
A mere three months after his television debut, Lesnar defeated Rob Van Dam in the finals to be crowned the 2002 King of the Ring, and earn a shot at the Undisputed Championship at SummerSlam. He went on to defeat The Rock and become the youngest world champion in WWE history at age 25.
Lesnar would go on to win the 2003 Royal Rumble, win the WWE Title twice more and have one of the great rivalries of the last decade with Kurt Angle before departing the company in 2004, his final match being a poorly-received encounter with Goldberg at WrestleMania XX.
He would then go on to attempt a professional football career, failing to make the cut with the Minnesota Vikings, before entering the world of mixed martial arts.
Becoming one of the biggest draws in the entire company, Lesnar had mixed fortunes in the Octagon. Despite becoming UFC Champion in only his fourth professional fight, he suffered a serious stomach illness that kept him out for months and was TKO'd in his last two fights.
Returning to the company that made him famous, he resurfaced on Raw in 2012 and has feuded with John Cena and Triple H.
The reason The Next Big Thing is so high up the list is because at the time of his debut, those who were watching WWE knew we were seeing the industry's newest star; somebody who would carry the company for the foreseeable future.
Little did we know, at the time, it would last less than two years, but his King of the Ring victory accelerated Brock Lesnar's path to the top.