Street Fighter Artwork

The original Japanese version of Street Fighter II introduced an African-American boxer named "Mike Bison" (abbreviated as "M. Bison") as a boss character, a parody of real-life boxer Mike Tyson. In order to avoid any likeness infringement lawsuit from Tyson, Capcom rotated the names of three of the boss characters for international versions of the game: The final boss, called Vega in the Japanese version, was given the M. Bison name; the talon-wielding Spanish warrior known as Balrog in the Japanese version was renamed Vega; and the boxer became Balrog.
Street Fighter II proved to be popular due to all these factors, eclipsing its predecessor in popularity, eventually turning Street Fighter into a multimedia franchise.
The first official update to the series was Street Fighter II′ - Champion Edition (Street Fighter II Dash in Japan, as noted by the prime notation on the logo), which allowed players to play as the Four Devas (the computer-controlled boss characters) and also allowed two players to choose the same character (with one character drawn in an alternate color pattern). The game also featured slightly improved graphics (including differently colored backgrounds) and refined gameplay. A second upgrade, titled Street Fighter II′ - Hyper Fighting (or Street Fighter II Dash Turbo in Japan), was produced in response to the various bootleg editions of the game. Hyper Fighting offered faster gameplay than its predecessors, different character colors and new special techniques (such as Chun-Li's Kikoken or Dhalsim's Yoga Teleport).