The second season of Blue Bloods, a police procedural drama series created by Robin Green and Mitchell Burgess, premiered on CBS on September 23, 2011 and ended May 11, 2012.Donnie Wahlberg, Bridget Moynahan, Will Estes, Len Cariou are first credited, with Tom Selleck receiving an “and” billing at the close of the main title sequence. Jennifer Esposito retains her “also starring” credit from the first season, whilst Amy Carlson and Sami Gayle are also credited as “also starring” during the episodes that they appear.