The year is 2673…

Humanity is spread across the universe, but they are not alone…

In the year of 2629, a Terran Confederation (the organization that rules Humanity) spaceship, the TCS Iason, encounters a spacecraft of unknown origin. The Iason sent one last message before it was destroyed: "We have encountered an alien race… they are very aggressive… they have opened fire, and we can’t shake ‘em off… we send this message to the confederation HQ… beware of this race - the Kilrathi." The Iason disappeared, and no trace of it was left.

A war has begun. It continue for over 40 years… millions died… the Confederation and the Kilrathi assembled large fleets of ships, fighters and bombers. Then, in the year of 2670, the bitter truth was revealed - the Kilrathi are winning the war… and if the current trend will continue, they would walk on earth by the end of the year.

The confederation (also nicknamed as "Confed") began a series of defensive campaigns, while trying to secretly reach to the Kilrathi homeworld - Kilrah. The Confederation then called their elite force to lead these defensive campaigns... they called the Heepsters.

The Heepsters, assigned on the TCS Gypsy, destroyed huge fleets of evil Kilrathi, and by that, delayed humanity's doomsday. But, again, the classified truth, was that the Kilrathi had a lot more ships and fighters than the confederation, and they continued moving toward Earth.

And then, when everybody thought that humanity will perish… a single attack on Kilrah resulted in the destruction of the Kilrathi homeworld. As a result of this attack, the Kilrathi forces have surrendered, and the Heepsters (as a large part of the confederation army) retired.

But now, three years later, something evil starts to happen… and the Heepsters must return...