Metal Slug 4 Storyline In the year 20XX a cyber-terrorist group has struck out at the world by unleashing a computer virus through the internet with a sole purpose of hijacking the militaries of the worlds nations. Join Marco Fio and new Metal Slug team members Trevor and Nadia to stop the distribution of the virus before its too late. Metal Slug 5 Storyline A research installation developing the next-generation of Metal Slugs is attached by unknown forces and a disc containing Metal Slug secrets has been stolen. Lead Marco Tarma Eri and Fio into The Corridor of Fire to recover the secrets and destroy the paramilitary syndicate known as the Ptolemaic Army. Extensive power-ups of over-the-top weaponry health and ammo Fight off huge boss characters on each level and battle massive end bosses Metal Slug 5 features - Five massive stages and all new enemies Take up arms against this ultimate weapon of destruction The Doomsday Machine that fuses the mysterious power of ancient ruins with that of Metal Slug science Wage an assault on the enemys underwater stronghold Find a factory producing robotic weapons developed from the Government Armys data for next-generation Metal Slugs