M. Bison, known in Japan as Vega (ベガ Bega?), is a video game character created by Capcom. First introduced in Street Fighter II: The World Warrior, the character is a recurring boss and antagonist in the Street Fighter series of fighting games. A would-be world dictator, a pure incarnation of evil, M. Bison's ambition is to control the world's governments through his covert crime syndicate, Shadaloo (シャドルー Shadorū?, sometimes spelled as "Shadoloo", "Shadowloo" or "Shadowlaw"). He serves as the host of Street Fighter II 's fighting tournament and is the last opponent fought in the game. Bison first appears in the original Street Fighter II as the final computer-controlled opponent in the single-player mode, following the player's defeat of the other three Grand Masters. The battle takes place in the streets of Bangkok, Thailand in front of a crowd, where he poses with his cape prior to battle.
He was originally a non-playable character in the first edition of Street Fighter II, but became selectable from Champion Edition and onward, while maintaining his position as the final boss until Super Street Fighter II Turbo, in which a hidden character named Akuma defeats Bison and challenges the player as an alternate final boss.
The storyline through the numerous versions of Street Fighter II characterizes Bison as the leader of a terrorist organization called "Shadaloo" who sponsors the World Warrior tournament. A few characters who participate in the tournament have a personal vendetta against Bison. Chun-Li and Guile are both seeking to avenge the deaths of their loved ones (Chun-Li's father and Guile's best friend respectively), while T. Hawk wants to avenge both his homeland and his father, that were destroyed and devastated by the villain; the amnesiac Cammy, on other hand, believes that Bison is connected to her past and learns in her ending that she was once one of his agents.