It''s a rainy night in Manhattan, and not a creature is stirring except for... Ben Grimm. When an intruder suddenly appears inside the Baxter Building, the Fantastic Four--Mister Fantastic (Reed Richards), the Invisible Woman (Susan Storm Richards), the Human Torch (Johnny Storm), and the Thing (Ben Grimm)--find themselves surrounded by a swarm of invading parasites. These carrion creatures composed of Negative-Energy come to Earth using a human host as a delivery system. But for what purpose? And who is behind this untimely invasion?