Uncanny X-Men #28

INMATE X REVEALED! Our wildest UNCANNY story yet continues! A mysterious turn of events brings the New Mutants to the Uncanny X-Men, and the Outliers are nowhere to be found! All this plus the secret of Graymalkin Prison’s INMATE X revealed at last! Who is this incredibly lethal mutant powerhouse, and what does it mean for mutantkind?

LEGACY #728