Shadows of the Past (Paperback)

Long ago, the alien Quistalian leadership ordered its agent, Lucifer, to conquer Earth. A young Professor X stopped him, but the victory cost Professor X the use of his legs. Now Professor X claims he has evidence of a massive secret Quistalian invasion plan. To stop it he orders the X-Men on a series of urgent missions to three abandoned Quistalian facilities scattered around the globe. The purpose is to seize key pieces of alien technology from these sites and assemble that technology into a defense weapon to stop the Quistalian invasion.