Godzilla Unleashed begins 20 years after the events of Godzilla Save The Earth. With a meteor shower raining down on Earth, causing climate shifts and earthquakes. Simultaneously, the monsters of Earth begin to attack cities across the globe as a result of crystals growing on the ground. Factions form among the monsters of Earth as well as the monsters attacking them, totaling four monster factions. Choices within the story affect later events, including the relationships between the factions. 