Upon catching Jean and Scott Summers outside the moonbase, Stryfe takes them to a giant time portal he had constructed on the Moon. As Cable, Cannonball, Havok and Polaris make their way to the tower, a forcefield is activated that prevents any without the Summers DNA from approaching the tower just as Stryfe activated the tower's time portal technology. Stryfe planned this so he could confront Cable alone, and though Havok has enough genetic similarity to Scott to pass through the forcefield, doing so renders him unconscious. Cable finds himself hopelessly outmatched by Stryfe, but as they battle, Jean Grey and Cyclops break free and Havok regains consciousness. Driven to despair, Stryfe tries to collapse the active tower upon the X-Men. Cable grabs Stryfe and orders Cyclops to activate the time vortex, a plan that would kill both Stryfe and Cable. Cyclops reluctantly does so; both men are sucked into a massive vortex that is created as the tower explodes. Cyclops and Jean Grey begin to suspect that either Stryfe or Cable is Cyclops' son Nathan Christopher Summers, who Cyclops was forced to abandon and send into the future after Apocalypse infected him with a techno-virus.