BioShock 2 is a first-person shooter video game developed by 2K Marin for the Xbox 360 and PlayStation 3 video game consoles and the Windows operating system. The game is set in the fictional underwater dystopia of Rapture in a less Dieselpunk with more Biopunk 1968, eight years after the events of BioShock. The protagonist and player-controlled character are a Big Daddy under Alpha series type; a being that has had its organs and skin grafted into an atmospheric diving suit. Among the first of its kind, the player-controlled Big Daddy, named Subject Delta, 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 sends out her spliced up followers that she calls The Rapture Family and new Big Sisters in an attempt to deter Delta.
Another story in DLC named Minerva's Den follows other Alpha series Big Daddy named Subject Sigma is getting blueprints and codes from by help of Brigid Tenenbaum (supporting character from the first BioShock game) while the leader of Den and antagonist Reed Wahl is trying stop that from happening.