The world begins an era of great progress and great change. Former colonies of European nations declare independence and step out onto the world\'s stage, while military tensions are high between the Americans and the Soviets, who both strive to send a man to the moon. Miraculously, Japan\'s economy flourishes in the wake of destruction the last great war. But with all of these momentous events, one vital piece of information remains concealed: Now, more than ever, the threat of foreign invasion remains omnipresent.

Although first detected shortly after World War II, precious little information has been discovered regarding the aggressive entities that AEGIS collectively refers to as the Invaders. They are very skilled infiltrators, and have \'sleeper\' agents which are capable of blending in and living normal human lives for years. They are very aggressive, targeting civilians and military personnel alike. They are unpredictable; the nature and variety of their configurations seems to be limitless. Worst of all, they are almost totally inscrutable-- there is no apparent pattern to their attacks and targets. At this time, little meaningful contact has been made with any agents of the Invaders, so their agenda and objectives remain unknown.
Fortunately, mankind has risen to meet this new threat. AEGIS, the Alien Exterminating Global Intercept System, was formed immediately upon discovery of the Invader threat. AEGIS has been formed with full global financial cooperation, and operates with a high degree of autonomy, acting as a \"shield\" for all mankind. With bases all over the world and earth\'s greatest men and women working together against the Invader menace, AEGIS is the human race\'s best hope for victory against the intruders.

AEGIS utilizes the best tactical and scientific personnel available in the world, and has cutting-edge technology and carte blanche to develop whatever it needs to defeat the Invaders. However, this alone is not enough to subdue the Invader menace; to defeat these adversaries, new tactics and a new breed of fighter are necessary. This necessity has led to the discovery of Gate Keepers-- young adults with amazing abilities who can access \"Gates\", which channel massive amounts of energy from another dimension.

This new breed of fighter has proven highly effective against the Invader menace; at present, Gate Keepers are continually being discovered and trained all over the world. Because of their heroic efforts, the earth is safe-- but for how long?!
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