There are lines that the X-Men have sworn never to cross. But after the shocking events of Messiah CompleX, Cyclops realizes that some enemies--such as the Purifiers--need to be dealt with permanently - so he changes his strategy. Unfortunately, the X-Men can never know about it as Cyclops sends Wolverine, X-23, Warpath, and Wolfsbane to do the dirty work.

The X-Men as a team have always existed to safeguard both the future of mutant kind and that of humanity as a whole. But while the covert team of mutants known as X-Force would like nothing more than to look to the future, they're learning that their past just isn't done with them yet. The squad is catapulted into action when the lethal Legacy Virus goes missing, threatening the lives of every mutant on the planet. Wolverine and the young X-23 must...