Set in an alternative history 1960, the game places the player in the role of a plane crash survivor named Jack, who must explore the underwater Objectivist-dystopian city of Rapture, and survive attacks by the mutated beings and mechanical drones that populate it. The game incorporates elements found in role-playing and survival horror games, and is described by the developers and Levine as a "spiritual successor" to their previous titles in the System Shock series.