The main actors on the show "Blue Bloods" are Tom Selleck, Donnie Wahlberg, Bridget Moynahan, Will Estes and Len Cariou. Sami Gayle and Amy Carlson also joined the main cast in season five.
"Blue Bloods" is a police drama that airs at 10 p.m. Eastern Standard Time on CBS. It tells the story of the Reagans, a family of police officers in New York City. Tom Selleck stars as Frank Reagan, the NYPD Police Commissioner and head of the Reagan family. Donnie Wahlberg, Bridget Moynahan and Will Estes star as his children, Danny, Erin and Jamie, who are all police officers. Len Cariou plays Frank's father, Henry Reagan.
Danny's wife, Linda Reagan (Amy Carlson), was a recurring character in the first four seasons, but became a main character in season five. Erin's daughter, Nikki Reagan-Boyle (Sami Gayle), is another recurring character that joined the cast of main characters in the fifth season.
"Blue Bloods" also features a number of supporting cast members. These include Vanessa Ray, who joined the cast in season four as Eddie Janko and Marisa Ramierez, who joined the cast in season three as Maria Baez. Jennifer Esposito, who played Jackie Curatola, was also a supporting cast member in the first three seasons of the show.