Metal Slug is a run-and-gun video game released for the PlayStation 2, set in 2030, two years after its predecessor. The plot revolves around General Morden forming an alliance with Oguma, a powerful tech mogul, posing a threat to global stability. Players control characters Marco Rossi, Fio Germi, Tarma Roving, and Eri Kasamoto as they embark on a mission to dismantle this formidable coalition.
The game takes place in the year 2030, two years after the first Metal Slug game. Series antagonist General Morden becomes allies with Oguma, president of Oguma Enterprises and world leader of technology. Because this alliance could only stand to further strengthen Morden's military power, Marco Rossi, Fio Germi, Tarma Roving, and Eri Kasamoto set out to dissolve both parties.