LONDON'S BURNING! THE BLACK KNIGHTS RIDE AGAIN! All manner of vile extradimensional foes invade Earth following the collapse of Doctor Strange's magical safeguards for the planet. Dane Whitman, A.K.A. the BLACK KNIGHT, receives a terrible vision from the EBON SIEGE while Jacks, now sharing the burden of the EBONY BLADE with her father, rides off to confront a terrible evil attacking London-the X-MEN?! Krakoa's greatest heroes have been transformed-but by what?! Jacks, Dane and Faiza Hussain-bearer of the mighty sword EXCALIBUR-must team up to save the X-Men before an even deadlier threat destroys them all!