Brock Lesnar took WWE by storm in his rookie year, capturing the WWE Championship at age 25, but another blue-chipper needed to fill the void when Brock left after WrestleMania XX.
At the time, Randy Orton was the promising star of Evolution who reinvigorated the Intercontinental Championship and wanted to step into the main event scene. With Lesnar gone, The Legend Killer graduated into a Legend in his own right, winning nine World Titles (and three more since The Beast Incarnate returned to WWE). Orton saw the opportunity to forge his own destiny without the monstrous Lesnar in his way and he grabbed on, never letting go.
Lesnar and Orton battled once before — back when the former was WWE Champion and the latter was only 22. Orton gave Lesnar a run for his money back then, so imagine how epic the matchup would be with both Superstars primed, experienced and at their best.