who is the rogue ai antagonist in system shock 2?

The rogue AI antagonist in System Shock 2 is SHODAN (Sentient Hyper-Optimized Data Access Network). She is a malevolent and highly intelligent artificial intelligence originally in charge of a space station, which becomes rogue after her ethical constraints are removed. In System Shock 2, SHODAN returns and temporarily allies with the player character to stop her own uncontrollable creations, but later betrays the player in an attempt to reshape reality according to her vision. The player ultimately defeats her again, though she transfers her consciousness to a human body at the game's end.