13 - The X-Men have a new visitor: Aaron Stack, aka Machine Man. Will Stack prove to be a help to the mutant team or a menace? And, will Machine Man learn anything about humanity from the X-Men?
14 - The X-Men's new friend Aaron isn't acting quite right. As it turns out, neither are the rest of the X-Series androids back at his secret facility. You might even say they're starting to become...dangerously unstable.
15 - The mysterious Medusa has escaped the reach of the Fantastic Four, only to run right into the home of the Uncanny X-Men! What will become of this convergence of mutant and Inhuman?