George Clooney, who became famous as Dr. Doug Ross on the hit NBC series ER, is headed back for one last appearance on the series finale set to air this spring. Clooney and Julianna Margulies, who played his long-time love, will tape their final episode on Friday. The actor, who left the show in February 1999, was last seen on the show in May 2000 in a final scene of Margulies' last episode. NBC recently added three extra episodes to include appearances by the show's castmembers from its 15-year run including Anthony Edwards, Noah Wyle and Eriq LaSalle. (Photo: WENN)