Metal Slug 4 and 5 (2 Pack) - PlayStation 2 Metal Slug 4 features - Six challenging stages and a wide array of unique enemiesPlay as returning favorite characters Marco and Fio, or new characters Trevor and NadiaExtensive power-ups of over-the-top weaponry, health and ammoBattle massive end-level bosses in thrilling action Metal Slug 5 features - Five massive stages and all new enemiesWage deadly assaults on your enemy's underwater strongholdTake up arms against the thieves building next-generation Metal Slugs