Uncanny X-Men #7
"APOCALYPSE WARS" CONTINUES!
Fearing their teammate Archangel has once more fallen under the sway of the villainous Apocalypse, Psylocke and Magneto have embarked on a mission to save his life.
But they're about to make a discovery that will make them doubt everything they thought they knew!
Meanwhile, Sabretooth and M make a horrifying discovery of their own in the Morlock Tunnels beneath New York City...