Metal Slug X sets the stage for you to save the world. A power-hungry group of renegades has teamed up with aliens, and together they are planning to assume control of the planet. You are a one-man army whose mission is to squash the rebellion. There are four characters to choose from: Marco, Eri, Tama, and Fio. At the beginning, you've only got a gun and a few grenades, which isn't going to be enough. But as you rescue hostages, new weapons like rocket launchers, flamethrowers, bouncing shots, Molotov cocktails, and a shotgun are at your disposal. In addition to new weapons, you will also have access to a variety of vehicles including the Super Vehicle-001 mini-tank, Camel Slug, Slug Flyer, and Slugnoid, each packed with special weapons and abilities. The world is counting on you to stop the terrorist threat in Metal Slug X.