Thanks for the links. I've been conjuring up a D20F campaign inspired by Firefly. It's kind of funny how little we got to know about their take on space travel. For instance, what powered the ships? And was Serenity actually capable of faster-than-light speed, or merely near-light speed? The episode we see the ship's engine, we're given the impression the whole thing's mechanically powered, rather than tapping some awesome, physics-defying force like "hyperspace" or "warp speed". Of course, that was part of the show's charm, but it's somewhat vexing not to have those answers when trying to model an RPG....