The Skrulls don't expect the X-Men when they hit San Francisco, but that doesn't mean they don't have something prepared for Cyclops and his army when they find them at their new home.

The X-Men's guerilla war enters a new phase. But Nightcrawler is being subverted by a lost Skrull bible, and the Beast's search for a last-ditch anti-Skrull weapon requires one extra ingredient: a Super-Skrull to dissect...

When the alien Skrull army attacks San Francisco, they do not expect the X-Men to realiate, but the Skrulls counter with a devious attack, and the X-Men must decide whether to save thousands or condone a genocide.