Marvel is proud to announce that newly-exclusive writer Kieron Gillen (Thor, Generation Hope) will join Eisner-winning, superstar writer Matt Fraction as co-writer on Uncanny X-Men! Beginning with Uncanny X-Men #531, Fraction and Gillen pit the X-Men against what may be their greatest threat yet—the loss of their powers at the hands of the Sublime Corporation, as the malevolent force puts into action its master plan!