X-Men: Deadly Genesis (2005) #6

Everything that could go wrong has and now the X-Men are caught between a bizarre and powerful villain and the U.S. government. Cyclops and Marvel Girl remain in the hands of this mysterious new threat, and elsewhere, in the wreckage of a disaster, Professor X’s long-held secret finally begins to come to light. The white-hot creative team of Ed Brubaker and Trevor Hairsine continue to put the X-Men through the wringer in this special 30th Anniversary event, which also features a back-up tale written by Brubaker and drawn by Pete Woods.