<P> The sixth season of the American television medical drama Grey 's Anatomy , commenced airing on the American Broadcasting Company ( ABC ) in the United States on September 24 , 2009 , and concluded on May 20 , 2010 . The season was produced by ABC Studios , in association with ShondaLand Production Company and The Mark Gordon Company ; the showrunner being Shonda Rhimes . Actors Ellen Pompeo , Sandra Oh , Katherine Heigl , and Justin Chambers reprised their roles as surgical residents Meredith Grey , Cristina Yang , Izzie Stevens , and Alex Karev , respectively . Heigl was released from her contract in the middle of the season , while T.R. Knight did not appear as George O'Malley , because Knight was released from his contract at the conclusion of season five . Main cast members Patrick Dempsey , Chandra Wilson , James Pickens , Jr. , Sara Ramirez , Eric Dane , Chyler Leigh , and Kevin McKidd also returned , while previous recurring star Jessica Capshaw was promoted to a series regular , and Kim Raver was given star billing after the commencement of the season . </P>
<P> The sixth season of the American television medical drama Grey 's Anatomy , commenced airing on the American Broadcasting Company ( ABC ) in the United States on September 24 , 2009 , and concluded on May 20 , 2010 . The season was produced by ABC Studios , in association with ShondaLand Production Company and The Mark Gordon Company ; the showrunner being Shonda Rhimes . Actors Ellen Pompeo , Sandra Oh , Katherine Heigl , and Justin Chambers reprised their roles as surgical residents Meredith Grey , Cristina Yang , Izzie Stevens , and Alex Karev , respectively . Heigl was released from her contract in the middle of the season , while T.R. Knight did not appear as George O'Malley , because Knight was released from his contract at the conclusion of season five . Main cast members Patrick Dempsey , Chandra Wilson , James Pickens , Jr. , Sara Ramirez , Eric Dane , Chyler Leigh , and Kevin McKidd also returned , while previous recurring star Jessica Capshaw was promoted to a series regular , and Kim Raver was given star billing after the commencement of the season . </P>
when did season 6 of greys anatomy air
when did season 6 of greys anatomy air
commenced airing on the American Broadcasting Company ( ABC ) in the United States on September 24 , 2009 , and concluded on May 20 , 2010
commenced airing on the American Broadcasting Company ( ABC ) in the United States on September 24 , 2009 , and concluded on May 20 , 2010