The Twelve at last stand revealed... but will they live long enough to fulfill their destiny? While The X-Men grapple with what exactly The Twelve are, and what they're supposed to do, The Horsemen hunt down the members of the enigmatic group one by one! And with Armageddon drawing ever closer, Professor X must seek an alliance with the man who has nearly destroyed his dream: Magneto!
— Description from Comic Vine community (comicvine.gamespot.com).
