When Alice went through the looking glass, at least nothing followed her back through the mirror. But when an experiment in subatomic physics went horribly wrong, gateways to other worlds opened up - and Hell's own spawn was on the other side. Unless physicist William Weaver and Navy SEAL Robert Miller can close the gateways, every living thing on Earth will be replaced by the spreading interstellar blight called the Dreen. They could sure use a vorpal blade - because mere nukes may not stop the Dreen...