Five-hundred years after the decommissioning of Babylon 5, in the aftermath of the disastrous war between the Interstellar Alliance and the crypto-fascist Terran Supremacists, the surviving leadership of the IA puzzled on how to restore the fraying unity of the galaxy. No world existed that was not associated with a particular race or the increasingly-mistrusted Interstellar Alliance. It was realised that a true neutral venue was once again needed. So the leaders of the galaxy turned their minds back to the legendary place where the galaxy was first welded together in peace.
So inspired by this past triumph, it was decided to build a new Babylon station, deliberately mimicking the style of the original but including the most advanced technologies this era could offer. A mobile five-mile long fortified artificial world that was a combination of a free port and diplomatic neutral turf. Here at last the many grievances of the galaxy could be resolved without the pressures of history and geography. It was the last, best chance for peace, a shining star of hope, all alone in the night.
A hope threatened as never before by one selfish man on a mission of hate.