
I had an idea a long time ago to tie things together, though I don't remember the details as well anymore... but I think I remember the jist of it.
In the galaxy, there's three major players: The galactic police/enforcers/government agents, the big greedy corporation, and the space pirates. (I don't have actual names for any of them) The government tries to keep things in line, but have a bad history with non-human species. This has caused them to form clans outside of the government's space and become pirates, basically trying to live outside of their sphere of influence. The big corporation is just trying to control everything with money... they own their own planets, have big miltary contracts, and overall are probably the biggest evil in the universe.
One day, an excavation crew is on a planet and uncovers an ancient cache of weapons from an extinct civilization. They're massively powerful, and with the technology, any one person could rule over the galaxy with an iron fist. But a hologram activated during the excavation tells the crew that only those who display themselves as having the supreme fighting ability can cause the technology to come to life, which is where the fighting starts up.
So, for the government, we've got all of the police-like/human characters. For the space pirates, it's all of the aliens. And for the corporation, robots manufactured for "guaranteed" victory. All of them fighting for control over the technology that would ensure they come out on top.
What are some other's ideas/what do you think of mine?