Godzilla vs. Megaguirus G , Gojira tai Megagirasu J Shmetsu Sakusen? , lit. Godzilla x Megaguirus G Annihilation Strategy is a 2000 science fiction kaiju film directed by Masaaki Tezuka and written by Hiroshi Kashiwabara and Wataru Mimura. It is the 25th film in the Godzilla franchise, the 24th Godzilla film produced by Toho, and the second film in the Millennium series. The film premiered at the Tokyo International Film Festival on November 3, 2000. While the film utilized the Godzilla suit used in Godzilla 2000, it is not connected to the previous film.
In 2001, an experimental satellitebased weapon that fires miniature black holes, called the Dimension Tide, opens a wormhole through which a prehistoric dragonfly enters the present and deposits a single egg before exiting through the wormhole. A boy finds the egg and takes it with him when he moves to Tokyo. The egg starts oozing a strange liquid, so the boy throws the egg in the sewer. The egg, actually a mass of hundreds of eggs, splits up and starts growing when exposed to water, hatching into large dragonfly larva called Meganulon that come out of the sewer to feed. They flood a portion of the city and moult on the sides of buildings, becoming adult Meganula.Meanwhile, the atomic dinosaur Godzilla appears, in search of a source of nuclear energy, despite the edict shutting down all such attractants after his three previous appearances. While Godzilla is fighting the GGraspers, who are assisted by rebellious scientist Hajime Kudo, the swarm of Meganula are attracted in turn to Godzillas energy, and attack it. During the course of the battle the Dimension tide is launched, but Godzilla survives the attack. Most of the Meganula are killed by both Godzilla and the Dimension Tide, but a few manage to drain off some of Godzillas energy and return to the sewer. With the last of their strength, the Meganula inject Godzillas energy into a huge, sleeping larva that is in a giant, pulsating cocoon. It molts and appears from the water as Megaguirus, the queen of the Meganula. ........
Source: Wikipedia