#2. Brock Lesnar
Lesnar came in at around the same time as the likes of John Cena and Batista.
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His incredible stature soon made him a force to be reckoned with, and he captured the WWE Title from The Rock at Summerslam 2002. Lesnar had perhaps the greatest rookie year in WWE history, as he went on to win the Royal Rumble match in 2003, and became the WWE Champion at WrestleMania XIX.
Brock ran roughshod over the SmackDown locker room for a year, before leaving the WWE to focus on a possible NFL career. An injury crushed Brock's NFL dreams and he began working for NJPW. Soon after, Lesnar joined the UFC and became one of the biggest stars there. He came back to WWE on the Raw after WrestleMania 28.
Brock had become bigger than the WWE at this point. He carried tons of mainstream attention back to the company. Ever since then, WWE has been securing Brock Lesnar for a string of perk-filled contracts. Lesnar's contract allows him to miss multiple Raws and PPVs in succession, forcing the fans to dub his reign as being "The reign of terror".