Outlaw mutants united in a group of bloodthirsty mercenaries who are willing to do anything for mutantkind -- and to stay alive.
All brought together by a time-displaced Cable, to stop the advance of a mysterious technology that could bring about the end of mutantkind in an inevitable future.
The X-Men have returned, now with the intention of being seen as superheroes by the general public.
Only a select group of mutants decides to ally themselves with Charles Xavier's cause, cause they all understands that there is something much bigger at stake, an imminent danger that could cause an inter-species war.