An experiment in space gone horribly wrong; that's usually how it all starts. The result? Hundreds of thousands of hostile aliens watch and wait for their chance to invade Earth and exterminate the human race. Payback. Mankind's hope rests in the hands of a few friendly aliens out there who somehow see the value of human life because they know us. They should know; after all, they came from Earth. In many ways, these aliens know us better than we know ourselves. But some of them are working against us, plotting to overthrow the very foundations of humanity. If we don't figure out a way to stop them, it will surely be the end of us!