"In the arcade version, one summer night in 1991, an enemy fleet known as the Strange Fleet approached a small island of the Mediterranean Sea. When it arrived, very few saw the Strange Fleet. Two years later, while the Stranger Fleet expanded itself, it created a world war. It is unknown by everyone around the world who noticed the attacks of the Strange Fleet. As the Strange Fleet continues their assault, many against them cried "Fire Shark! Fire Shark! It's time to take off!! Beat them for our sake. Go! Go! Fire Shark!"
In the Sega Mega Drive / Sega Genesis port, in the year 19X9, on an alternate Earth, a global super-power known as the S Corps, which specializes in a heavy industrial army, begins invading various countries. All seems lost when a phantom pilot flying a super-powered biplane called the Fire Shark flies in to save the world from domination."
Source: Wikipedia, "http://en.wikipedia.org/wiki/Fire_Shark," available under the CC-BY-SA License.