BioShock 2 is a first-person shooter video game developed by 2K Marin for Microsoft Windows, PlayStation 3 and Xbox 360. The sequel to the 2007 video game BioShock, it was released worldwide on February 9, 2010. The OS X version of the game was released by Feral Interactive on March 30, 2012.
The game is set in the fictional underwater dystopia of Rapture. The game opens with a cutscene set in 1958 then jumps 10 years to when Delta wakes up in 1968, eight years after the events of the first BioShock. The protagonist and player-controlled character is an Alpha series of Big Daddy, a human being that has been mentally conditioned to protect Little Sisters which is amongst the first of its kind. The player-controlled character Big Daddy, named Subject Delta who was previously paired with a single Little Sister, reactivates with no recollection of the past decade's events and scours the city in an attempt to relocate the Little Sister that he was paired with. Fearing this reunion will ruin her plans for the city, Sofia Lamb, the antagonist, sends out her spliced up followers that she calls "The Rapture Family" and new Big Sisters in an attempt to deter Delta.