Cover By Adam Kubert Mark Millar & Chuck Austen (w)/ Adam Kubert, Essad Ribic & Chris Bachalo(p) To win humanity's trust, The X-Men take their first-ever, world-spanning field trip - and face Professor X's greatest secret! Collecting ULTIMATE X-MEN #13 - #20! 'ULTIMATE X-MEN has that dark edge that only Mark Millar's best Authority stories once enjoyed.' -Comics International