Uncanny X-Men #6

"APOCALYPSE WARS" CONTINUES! The first time original X-Man Archangel met Apocalypse, he was transformed into the homicidal Horseman of Death. Breaking free of Apocalypse's grasp, Archangel eventually returned to the X-Men and formed a relationship with his teammate, Psylocke. Now, years later, Psylocke has found a vacant, drone-like Archangel in the guise of Death once more. Fearing he's again fallen under Apocalypse's sway, Psylocke and her team of X-Men embark on a mission to save Archangel's life. But little do they know that they are about to discover a far more horrifying truth than they could have imagined?