Uncanny X-Men, Vol. 1 #488 (2007)

Endangered Species - The Extremists, Part Two
Even as a small team of X-Men escorts Caliban down into the Alley, the Morlock's old home deep under New York, the remnants of that group of mutants is striking out according to Masque's agenda. But will the X-Men discover what that is before it's too late?
Release Date: 2007