BioShock before Big Daddies, Splicers and moral dilemna

BioShock was one of the most anticipated titles of 2007, and rightfully so -- the blend of briskly paced action and emotionally engaging story redefined the FPS genre and attracted many players that had never played shooters before. Little do most casual fans know that BioShock once had nothing to do with Big Daddies, Little Sisters or even an underwater metropolis.