A young teenager has been rejecting her mutant powers ever since she discovered them. But when giant robots track her down, it's up to the X-Men to save her.

Breaking into the Mutant Control Agency's headquarters to destroy the registration files on mutants, the X-Men lose two of their members against the Sentinels, but eventually gain another.

Aware of an impending assassination which will create a catastrophic future, the X-Men must deal with threats both outside and within their team.