#6 Randy Orton (4,962 days; debut; SmackDown, April 25, 2002)
With an influx of talent hoping to make a mark in the post-Monday Night War era of sports-entertainment, a fresh-faced rookie named Randy Orton walked into Mr. McMahon’s office before his official tryout match. The Chairman raved about Orton’s pedigree, but even he couldn’t have guessed what The Legend Killer-turned-Viper-turned-Face of WWE would accomplish in his career. He’s the youngest World Champion in history, capturing the title at age 24. He unified the WWE and World Heavyweight Championships to form the WWE World Heavyweight Championship in 2013. He’s risen through the ranks of Evolution and led the charge with The Legacy and The Authority.
Twelve years and 12 World Championship reigns after first walking onto WWE TV, Orton has matured into a sports-entertainment icon.