Two Years Ago during Zang Zip's invasion,The soldiers,except Marco Rossi,are killed. In the Presents,Rossi was recruited for the special army strike force,Peregrine Falcon along with his friend,Tarma Roving,to fight against the Rebel Army,led by General Donald Morden.

Marco & Tarma are joined by S.P.A.R.R.O.W.S agents,Eri Kasamoto & Fio Germi,and drove their tanks,Metal Slug. They rescued the prisoners from Allen O'Neil and took down the Mini Bata. They soon discovered that the Mini Bata contains alien tech. The Team are ambushed by the Rebel Army and Marco was captured. He was taken to Morden's base where he reveals that he made a deal with the Alien Leader and led the Rebel Army to destroy the Regular Army when his wife & daughter are taken from him.

Tarma & the S.P.A.R.R.O.W.S freed Marco,killing Allen,& escaped,but being pursued by Morden on a gunship,Hi-Do. Marco managed to fire the bazooka,taking down Morden. As the team celebrated their victory,Marco & Tarma suspected that the war with the aliens are far from over.

Mid-Credits: Morden survived the crash and meets with the Alien Leader.