Collects no. 19-24 of "Astonishing X-Men" and no. 1 of "Giant-Size Astonishing X-Men," in which the team of super-powered mutants rushes to save the Earth from the destructive plans of the Breakworld.

Abigail Brand, director of S.W.O.R.D., thought she was on a routine search-and-destroy mission until she found a laboratory overrun by vicious aliens known as the Brood. With her spaceship damaged and plummeting to Earth, she hopes the X-Men can help her - but the situation goes from bad to worse when a deceased young mutant reappears transformed into a flesh and bone version of the mutant-hunting Sentinels.

"A family like none other! Through thick and thin, from marriage to apocalypse, these X-Men stood together. But bonds are broken and loyalties tested as the series barrels toward its astonishing conclusion! After she incites an international incident and is declared an enemy combatant by S.H.I.E.L.D., Warbird goes on the lam in Cairo. As she seeks out an ancient artifact with ties to her alien race, the Shi'ar, the deadly soldier will stop at nothing...