Grey's Anatomy is an American medical drama television series. It follows the lives of five surgical interns, later residents and their mentors in the fictional Seattle Grace Hospital in Seattle, Washington. The pilot episode, "A Hard Day's Night" premiered on March 27, 2005 on ABC. Since then, five seasons have aired, and the sixth season began on September 24, 2009. The show has attained commercial success and critical acclaim. Initially airing as a Midseason replacement for the legal drama Boston Legal it gained high viewership, with the first episode watched by 16.25 million viewers, and the first season finale attracting 22.22 million viewers. Winner of two Emmy Awards and two Golden Globe Awards, the show is one of the most watched prime time television series.