The second season of the American medical drama television series , Grey 's Anatomy , commenced airing in the United States on September 25 , 2005 .
The second season of the American medical drama television series , Grey 's Anatomy , concluded on May 15 , 2006 .
The second season of the American medical drama television series , Grey 's Anatomy , commenced airing in the United States on September 25 , 2005 and concluded on May 15 , 2006 .