Chaigidiel was one of SaintLogic Inc.'s test subjects that were released by Dr. Thomas Koppelthorn as part of his revolt.
Metal Gear
Metal Gear (Japanese: メタルギア, Hepburn: Metaru Gia) is a series of action-adventure stealth video games created by Hideo Kojima and developed and published by Konami. The first game, Metal Gear, was released in 1987 for MSX home computers. The player often takes control of a special forces operative (usually Solid Snake or Big Boss), who is assigned the task of finding the titular superweapon "Metal Gear", a bipedal walking tank with the ability to launch nuclear weapons. Source: Wikipedia
