I'm gonna take on Green Lantern too, because thedoctor is a drunk and should not be trusted.
First of all, I'd get rid of the Guardians. Fuck them. There's not a whole lot to do with them, as evidenced by the fact that they keep turning them into bastards and yet for some reason the Corps still put up with them. One day the Guardians go too far and there's a big fight between all the Green Lanterns and them. Or maybe they're killed in a freak kitchen accident, whatever. Anyway, Alan Scott is elected as the sole New Guardian since he's got that meteor inside him so he can create new rings, and also because he's the first Green Lantern ever and it's ridiculous that he isn't even in the book.
When news that the Guardians are dead spread around, criminals all over the universe go apeshit, raping and pillaging entire galaxies and forming fleets of space pirate ships. These ships travel mostly in the empty voids between sectors, boarding the spaceship of every bastard unlucky enough to run into them and adding it to the fleet. Hal Jordan is sent out to infiltrate a pirate fleet and gather intel for an eventual GL smackdown. However, Jordan finds that not everyone in these ships is so bad (some people have joined out of fear or necessity), further complicating the situation.
