Once you were but a humble humanoid Splicer, taking down Frank Fontaine and Andrew Ryan with naught but your own frail body and a whole armory of weapons and plasmids. In BioShock 2, you are now someone else - something else. Subject Delta, a prototype Big Daddy. An Alpha model of the same roaming monsters that hoard the Little Sisters, gatherers of precious ADAM. 8 years after what happened in BioShock, a new leader tries to take hold of Rapture once more. In your pursuit of the one Little Sister that was bonded to you long ago, you'll have to take up arms and Plasmids once more, modified to befit the brute and grand power of a Big Daddy. Will you show kindness or greed to the Little Sisters that land in your control? Whichever choice you make, it may very well affect the one closest to your heart...