The diary of David Haller; son of Professor Xavier; the world killer. Diagnosed as a paranoid schizophrenic and institutionalised, David eventually finds out he has mutant abilities and realises that the voices he hears and things he sees may be real. David works with various groups of people in order to explore and control his mutant abilities. One day, he is visited by a version of his current girlfriend in the future who warns that he was going to destroy the world. David is sick of the accusations and those he loves seeming to turn against him. The people he thought were his friends have begun working alongside his archenemy, Amahl Farouk (aka the Shadow King), who they had previously been attempting to defeat. ~ Professor Xavier had given up David after defeating the Shadow King. However, the Shadow King's consciousness still lingered and found David, attaching himself like a parasite within the latter's mind. To exact revenge on David's father, the Shadow King used David's own power to make itself stronger, planning on seizing complete control of David's body to achieve this. ~ Following influence from the voices in his head, David decides to take his own path and, ultimately, becomes "Legion, the world killer".