From the introduction: The lost hope of the Regular Army, which has been stolen by the enemy. The famous "Metal Slug", which despite its small size, shall prove capable of going through countless wars and invasions, involving forces from this world and beyond. The year is 2028 and General Donald Morden, leader of the Rebel Army and former Vice Admiral of the Regular Army, has sent an ultimatum. The world's major cities shall be his within 170 hours, and with the Regular Army being almost completely routed by the Rebels, it seems like this statement shall ring true. But there are two people standing against him.