X-Factor Epic Collection: The Morlock Massacre

The most brutal X-crossover of its era rocks X-Factor and forever changes Angel's life. When the savage Sabretooth and his fellow Marauders launch a killing spree against the Morlocks, a community of mutant outcasts living beneath Manhattan, X-Factor joins unlikely allies Power Pack and Thor to save whoever they can.

But Warren Worthington III faces a terrible sacrifice. In the aftermath, Boom-Boom returns to cause trouble for Beast and Iceman, Apocalypse rises with three deadly Horsemen, and tensions between Scott and Jean threaten to boil over. Written by Louise Simonson, Walter Simonson, and Peter David, collecting X-Factor #10-20 and related crossover issues.