The Invaders invasion is the name of the event that takes during the time period from April 2031 to May 2031 and is seen in Metal Slug 6. General Morden and the Rebel Army vanished once more after the end of the Third Modern War, and they had not staged any invasions since. It seemed that at long last, the world would finally recover from its war-torn wounds. However, various testimonies involving sighting of aliens and giant creatures are collected seem to suggest that another conflict is on the horizon.