Metal Slug is a Japanese multimedia franchise and run and gun video game series originally created by Nazca Corporation before merging with SNK in 1996 after the completion of the first game in the series. Spin-off games include a third-person shooter to commemorate the 10th anniversary of the series and a tower defense game for the mobile platform. Originally created for Neo-Geo arcade machines hardware and the Neo-Geo home game consoles hardware, the original games have also been ported to other consoles and mobile platforms throughout the years, with several later games created for various other platforms. The games focus on the Peregrine Falcon Squad, a small group of soldiers who fight against a rebel army, aliens, zombies, mummies and various other forces intent on world domination.