Ultimate X-Men v06 - Return of the King (2007)

Collects Ultimate X-Men (2001-2009) #26-33. Magneto, the X-Men's deadliest villain, returns. They've faced the Weapon X program, Proteus and even the superhuman strikeforce known as The Ultimates. Now, still licking their wounds from their prior battles, can Xavier's mutant team possibly survive the return of their most powerful foe?