Play as an overpowered boss monster who has decided to go on a rampage.

Aliens visited Earth and met with the President, secretly brainwashing him so that they can rule Earth.

The US Government needed something to protect Earth from an impending alien invasion.

G-zilla was created as a special defense weapon in a government science laboratory, but one day a science experiment went wrong, and he begun to turn on everyone.

G-zilla gone mad and escaped into the city, blind with rage to destroy anything in his path.