Raiden , real name Jack , is a character and one of the protagonists of Konami's Metal Gear series of action-adventure stealth video games. Created by Hideo Kojima and designed by Yoji Shinkawa, Raiden was introduced in the series as the main player character of the 2001 game Metal Gear Solid 2: Sons of Liberty. In Metal Gear Solid 2, he appears to be a member of the U.S. special operations unit FOXHOUND and is participating in his first mission against terrorists. Despite coming across as a young rookie, he is later revealed to have been a child soldier in his native Liberia. Raiden also appears as a supporting character in the 2008 game Metal Gear Solid 4: Guns of the Patriots, in which he is assisting the series' main protagonist Solid Snake in his fight against Revolver Ocelot's forces. He is also the main character of the 2013 game Metal Gear Rising: Revengeance, in which he is dealing with his past and his present life as a combatant who faces enemies from private military companies.

Metal Gear is a franchise of stealth games created by Hideo Kojima. 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, who is assigned the task of finding the titular superweapon, "Metal Gear", a bipedal walking tank with the ability to launch nuclear weapons.