No Man's Land is the fourth episode of the first season and the 4th overall episode of Grey's Anatomy. Cristina's encounter with Ellis Grey's former scrub nurse, who is now a patient at Seattle Grace, changes her forever. George becomes infuriated when he realizes that Izzie and Meredith treat him like their sister. An old part of Izzie's life will be revealed which makes her the subject of hospital gossip and Derek, Meredith, George and Alex have a patient with nails in his head. Izzie…