Uncanny X-Men, Vol. 1

Weeks after having returned to Earth, Charles has learned that Magneto has apparently resurfaced. Determined that mutants should be the ones to find him, he risks using Cerebra despite both Beast and Nightcrawler's warnings. But before he can look for his old friend, he finds another ally of the X-Men trying to reach the mansion's grounds. Caliban has been seriously injured by the Morlocks, when he and Leech were wandering the Alley, their old subterranean home. Now Leech is in the hands of Masque, one of the most dangerous and sinister members of the Morlock clan.