Chapter 1
10 Years after the events of Gamera 3...
Deep in the Hokkaido rain forest in Japan, uninhabited by humans, 1 Gyaos egg remained. It hatched and began to feed on the animals in the forest ... it started to grow...

5 years later...
NASA detected a massive meteorite heading to Earth. It was 150 meters tall and 200 meters wide. NASA couldn't stop the meteorite and was on a collision course to Earth. NASA estimated the meteorite's impact point is in the Hokkaido rain forest.

Hokkaido rain forest
The Gyaos hatchling, now 5 years old has grown to a height of 50 meters. But this Gyaos was different... It didn't want to attack or eat humans, it just wanted to live alone in peace.
While Gyaos was eating a group of cows on an abandon farm it suddenly look towards the sky ... it felt an evil creature was coming... Gyaos didn't worry much about this feeling he was getting and went back to his feast. Then the sky slowly turned dark. Gyaos looked up to the sky again and saw a small rock like object falling down from the sky ... slowly the small rock got bigger and bigger... Gyaos thought it might be Gamera, the guardian of the universe, but it couldn't be... Gamera was hibernating deep below on the ocean floor. So what could this rock be? Gyaos stopped eating and called to the object. The Object didn't respond. Gyaos was confused... Gyaos ducked just as the object crashed to the Earth. The impact the meteorite caused felt like a magnitude 8 earthquake. The object crashed 400 meters away from Gyaos, so Gyaos went to see what this strange object was.
Still glowing a red/orange color from travel through the earth's atmosphere Gyaos waited for the object to cool down. As the object cooled down Gyaos felt that same feeling of something very evil ... maybe this feeling was coming from the meteorite?