In the year 22XX, fragments from a meteorite that crash-landed on Earth lead to the discovery of a mysterious new mineral known as Force Metal.   Advancements made possible through the application of Force Metal revolutionize Reploid engineering, and a massive artificial island known as Giga City is constructed to mine its valuable ore.   At first, operations on the island appear to be running smoothly...   But one day, a group of Reploids on the island arm themselves, declare themselves the Rebellion, and rise up against the authorities.   The government identifies their leader, Epsilon, as a Maverick and dispatches an elite team of Maverick Hunters to Giga City.   And so, on the colossal artificial island of Giga City, X’s fierce battle begins.