Прибульці: предки давніх богів

Aliens in our ancient past is practically common knowledge. They came millennia ago, fought a great war between themselves and left behind a history of their occupation, vestiges of a long lost culture from another planet and a sudden departure - but why? After eons these beings have now returned and are engaged in a battle with humanity itself and some researchers believe they have returned to manipulate and use mankind to a sinister end.