Blue Bloods is an American police procedural drama television series that has been airing on CBS since September 2010. Its main characters are members of the fictional Reagan family, an Irish-American Catholic family in New York City with a history of work in law enforcement. Blue Bloods stars Tom Selleck as New York City Police Commissioner Frank Reagan; other main cast members include Donnie Wahlberg, Bridget Moynahan, Will Estes and Len Cariou for all Eleven seasons, plus Amy Carlson (seasons 1–7) and Sami Gayle (season 1 – present, played by Marlene Lawston in the pilot episode).
The show is filmed on location in New York City with occasional references to nearby suburbs. The series debuted on September 24, 2010, with episodes airing on Fridays following CSI: NY before being moved to Wednesdays at 10:00 p.m. Eastern and Pacific time and 9:00 p.m. Central and Mountain time for a four-week tryout. After fourweeks, it returned to its original Friday 10:00 p.m. Eastern time slot, where it has remained since. In May 2020, CBS renewed the series for an eleventh season, which premiered on December 4, 2020. In April 2021, CBS renewed the series for a twelfth season.