The fifth season of "One Tree Hill" will be unprecedented in the annals of television drama, as the show leaps forward four years. Season four ended as the young characters graduated high school and season five begins post-college, four years later. Some of the characters have found success while others have failed. Some are the same, some are very different. And while their storylines will actively move forward, the show will also dip into the past, returning to incidents and events of the last four years, sometimes for a moment or a scene, other times for an entire episode.