The Timebroker sends the Exiles on a new mission to keep an evil Havok from going on a killing spree! But not all of the Uncanny X-Men are willing to cooperate!

The body of Alex Summers, the X-Man called Havok, is about to be overtaken by the conciousness of a darker, alternate version of Alex Summers and disrupt this dimension's timeline by murdering two very special children.

This story-arc also contains the first meeting between Nightcrawler and his alternate-reality daughter, Nocturne