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BioShock and BioShock 2 take place in the fictional underwater city of Rapture. Built in the late 1940s by business tycoon Andrew Ryan, it was meant to be a laissez-faire utopia for humanity's elite to work, live, and prosper out of the increasingly oppressive hands of the world's governments and authorities.

The scientists of Rapture soon discovered a substance called ADAM found in sea slugs on the ocean's floor. With ADAM, they could create plasmids that would overwrite a person's genetic material, granting them superhuman-like abilities, and soon became a valuable commodity. They devised a means of harvesting ADAM using little girls, named "Little Sisters", implanting the sea slugs in their stomachs. ADAM was found to lead to mental instability in its users, and along with other political and social movements within Rapture, the Little Sisters became targets of those desiring more ADAM. To protect them, the scientists created Big Daddies, mentally conditioned and mutated humans in armored diving suits that drove off any attackers from Little Sisters.

On the eve of 1959, war broke out in Rapture between its classes, fueled by ADAM-addicted "Splicers". The war left Rapture a dystopia within a year, with the few non-ADAM users sheltering themselves from Splicers.