X-Men Vol. 1 (1963-1981) / The Uncanny X-Men Vol. 1 (1981-2011) #521

Plot

What on Earth is Magneto doing on top of Mt. Tamalpais, just across the Golden Gate Bridge from San Francisco? He's not telling and the X-Men Psychics can't get it out of his brain. But he's been up there for days plotting something that will rock the X-Verse to its core. All this while Wolverine, Psylocke, Colossus and Fantomex take on the foes that have been plaguing the X-Men since the start of "Nation X".