The Legendkiller, Randy Orton.
The third generation superstar is still on a rise, and he is still in his prime. His fame began when he joined Evolution, which many call the best stable of this decade, with HHH, Batista and Ric Flair.
Along the road, all Evolution members held all the Raw titles, with HHH as the World Champion, Orton as the IC champion, and Batista & Flair as the Tag Team champions.
At SummerSlam 2004, Randy Orton made history by becoming the youngest World champion ever, after defeating Chris Benoit for the title.
HHH, surely, did not agree with this, and threw Orton out of Evolution, which led to Orton's (unsuccessful) babyface run, his title reign lasted only one month, and the crowd reactions were not good enough.
The WWE tried to re-cement him in the main event status by turning him heel again, and keeping him in the main event scene and giving him feuds with Undertaker, DX, John Cena, etc., but he went for nearly three years without another World title reign. Until late 2007...
Orton went by a new gimmick after winning the WWE title twice at the same time, he had this whole "One Man Dynasty," "The Age of Orton" thing going on where he held on to the title for seven months, until HHH took the title from him at Backlash 2008, yet the feud continued.
At One Night Stand 2008 there was a "Last Man Standing" match scheduled between Orton and HHH, during the match, Orton broke his collarbone and took a 4-5 month break.
After his return, Orton began to get a lot of cheers, and rumors were going that they would turn Orton babyface, but nothing happened, as he remained as Raw's top heel by winning the Royal Rumble after his return, and won the WWE title from HHH at Backlash.
There is still a lot of potential in Orton, and he is just in his prime: "The Age Of Orton" continues!