Fifty years after the Red Faction resistance and their Marauder allies liberated Mars from the brutal occupation of the Earth Defense Force, the threat to harmony on the Red Planet is re-emerging. This time, the hostile force is a deadly creature shrouded in mystery. When a giant terraformer, providing Mars with an atmosphere and climate similar to Earth's, is destroyed, chaos engulfs the planet – powerful tornadoes and storms rage. To survive, the Colonists flee to underground mines and build a network of habitable caves.