Bomberman is a strategic, maze-based computer and video game franchise originally developed by Hudson Soft. The original game was published in 1983 and new games in the series are still being published to this day. Today, Bomberman is featured in over 60 different games. Being commercially successful, with over 10 million units of games sold, the series "has since become known as the first name in multiplayer games".
The games are set somewhere in a galaxy known as the Bomber Nebula, on Planet Bomber. The original MSX game (as well as the PS1 version) had no real storyline. The NES and Game Boy versions begin with "Bomberman" (the eponymous character of the game) growing bored of making bombs in an underground factory of the Bungeling Empire. After hearing a rumor that robots reaching the surface become human, he decides to escape. When he does, he transforms and becomes known as the "Runner." This storyline was discontinued (outside of possibly Act Zero). In the Turbografx-16 game, Bomberman is instead the first robot of his kind created by Dr. Mimori. Despite being a prototype, he accepts his role as a defender of justice.
To distinguish him from other Bombermen, the main character is also given the name White Bomberman (or Shirobon). In earlier appearances, the second Bomberman model (known as Black Bomberman) is an enemy due to a programming error, but starting with Super Bomberman the two have forged an alliance. They have joined forces to handle bigger threats, most notably the evil alien Bagulaa (also spelled Bagular, Burglar or Bugler), who is most infamously known as the creator of the Five Dastardly Bombers. Paths were also crossed with an intergalactic crime organization called the Hige-Hige Bandits (led by Mujoe and MechaDoc), as well as a mysterious rival known as Regulus. There is no central series antagonist, but these are the most common.
Bomberman appears to be part of an intergalactic police force to help protect the galaxy. This has been elaborated upon in later games, where a friendly figure named Dr. Ein directs Bomberman's objectives. There is also Bomber Base on Planet Bomber, where Bomberman trains daily. After the shapeshifter (if fed) Pommy was introduced, Charaboms became a part of the gameplay in some later single player games. A Bomberman model called Max also became a semi-regular member of the crew, seemingly replacing Black Bomberman in those appearances.
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Official Site: Hudson Soft
Links: Bomberman's Wiki Article Bomberman Jetters Fansite Mobygames Entry