rpg.net and their forums there (like every other day, alright?), and I came across this fantastic campaign concept/setting riff as an alternate setting for the upcoming DC Adventures game (or Icons or Savage Worlds Supers, etc.).
The basic premise is that the Manhunters, the original - and failed - attempt from the Guardians to form an intergalactic police force have found god. A machine god. The first tenant of their god is this: "all who live are guilty." The second tenant is thus "all who are guilty deserve death." The robotic race of Manhunters, millions strong and each as powerful as Hal Jordan or Clark Kent, have started a jihad against all those living across the universe.
The End is the Beginning.
Lexcorp was of course the best chance for escape with its several large eco-cruisers, but there were other options and not just the rich made it off the planet. There were several other, smaller ships prepared and launched before Earth was no more including the super intellects of S.T.A.R. labs and the creative and innovative masterminds behind Wayne Enterprises.
Amanda Waller are the only civic opponents to Luthor's otherwise unopposed rule. Waller is doing her best to rebuild the covert operation Checkmate, but any ear could be bent Luthor's way, and the rebuilding of her Suicide Squad, now with more meaning than ever, is slow-going.
The largest minority population amongst the human survivors is that of the meta-human. Apart from their inherent value in an dangerous universe, many of them were able to escape on their own accord without any assistance or reliance on some corporate bigwig or out-of-touch scientist. The large population of super-powered individuals has given the great galactic empires cause for concern as the humans work to find a new home. Of course not all those who survived did it by escaping Earth. Rumors run rampant across the fleet of bands of heroes escaping in time or across the multi-verse. These rumors have yet to see any evidence to prove them true. Of course everyone believes S.T.A.R. is working on it.
General Kent and The Batman
And then there's the rumor of the Batman. It started simply enough - one of the S.T.AR. scientists believed they saw a cloaked creature escaping out a duct in her lab aboard the tiny S.T.A.R. adventurer Solar. The Solar has less than 10 scientists and crew combined. An alarm was set off and the ship thoroughly searched, but the creature was never found. Word got out and soon enough there were reported sitings of the Batman aboard every ship of the fleet. President Luthor has since proclaimed the Batman as a terrorist trying to finish the job the Manhunters started. General Kent denies any knowledge of his former ally's survival of the cataclysm or presence in the fleet. The rumors of conspiracy have led many to believe that President Luthor is wrong; it's not the work of the Batman but the Batmen.
The War and the Corps.
There are two Green Lanterns assigned to protect the Human fleet: Kyle Raynor and John Stewart. Although they respect General Kent's law, they disregard anything President Luthor orders. As a result there is an uneasy conflict of jurisdiction, and Luthor is doing everything he can to build mistrust amongst the people of the fleet for their protectors. Elsewhere, Lanterns are dying by the hundreds in their war against the Manhunters.
That's all I have for now, but damn do I want to play in this setting! It's wide open for any meta-human to have lived, and I think it's chock full of mystery and adventure. Clearly there's some Battlestar Galactica influences here. One suggestion on that thread is to include human look-alike Manhunters in the fleet sabotaging any future efforts to rehabilitate the human race. I like it, but I didn't want to take BSG's lead word-for-word. I love the idea that the human fleet is basically a powder keg of super-humans just waiting to explode on the next empire they come across.
I'll admit that I'm not as familiar with DC as I am Marvel, so I know there's a lot of room to expand here. For example, which, if any, supervillains would Luthor had smuggled aboard his ships? Which other superhumans can survive on their own in space and may have formed a small group, leaving humanity behind forever (or not forever, just for now)? There's a lot of potential here, and I would gladly take anyone else's suggestions to expand the setting!