It's the all-new Sentinel series vs. X-51 (who's part Sentinel himself)... with the X-Men waiting in the wings! Before X-51 exposes the long-hidden secrets of the leader of the Hellfire Club, Sebastian Shaw sends a new series of Sentinels to utterly destroy him! And just when things appear darkest, bursting through the rubble comes the Uncanny X-Men!
— Description from Comic Vine community (comicvine.gamespot.com).
