In an effort to get rid of Godzilla once and for all, Japan develops a device which is supposed to open up a black hole, allowing its people to blast the giant city-stomping lizard creature into another dimension. While the hole is opened, an insect from that other dimension sneaks through and lays an egg, which finds its way into the sewers of Tokyo. Before long, a swarm of alien insects--which feed on Godzilla's energy--are wreaking their own brand of havoc on Japan and its citizens.