World War Hulk: X-Men is a three-issue mini-series published by Marvel comics. It ties in with the World War Hulk story arc and concerns Professor Xavier's role in the Illuminati and the Hulk's exile into space. Xavier was absent when the Illuminati decided to send the Hulk away and so the Hulk comes to the X-Mansion seeking to be enlightened by Xavier on what he would have decided had he been present. On a side note, this part of the World War Hulk storyline took place before, during, and after Endangered Species.