In the game of BioShock you are venturing through the under water city called Rapture. A city created by Andrew Ryan to, in Ryan's words,"The artist would not fear the censor, where the scientist would not be bound by petty morality, where the great would not be constrained by the small," in the only place he felt the parasites could not touch. In the city there are girls called Little Sisters who care the one thing everyone is after, Adam. Since the Little Sisters are pretty much defenseless, the Big Daddy was created. There are many different kinds of Big Daddy's that you come across in both BioShock and BioShock 2. You will come across the Bouncer, Rosie, Rumbler, Alpha Series, and Lancer series. They all have the soul purpose of protecting the Little Sisters from all the dangers of Rapture. They will attack if they feel there little companions are threaten in anyway, and will continue to go after the Little Sister's attacker until they have been killed. The Little Sisters even carry little replicia dolls of the Big Daddies that they make out of whatever they can find in Rapture.
