Godzilla, a gigantic creature from underneath the sea, has been both the bane and the savior of Earth. Godzilla's power is so feared that scientists have begun experimenting on it's DNA and creating artificial G-Cells of the monster's power. A group of aliens, named the Vortek decide to invade the Earth to take away G-Cells created using Godzilla's DNA. They do this by controlling various other gigantic monsters, who will battle amongst themselves. Only a monster with free-will would be able to destroy the Vortek's army and drive away the Vortek.