Firefly is based in the future, where some characters are the crew on this spaceship. The kind of spaceship is a firefly (it sort of looks like one) and it's named Serenity. There's a captain, and a bunch of other crew people, and this group carries cargo (sometimes risky or illegal) to places for some highly paid jobs. They're pretty rogue, and if they get caught by the Alliance (like the government) doing some of the illegal jobs they do, they'll be in big trouble. Another interesting thing about it, is that although it's future-based, it's also kind of like a western. The crew of Serenity are kind of like "space cowboys." The writing is superb, but the best thing about the series is the characters and how funny and unique they are. It has very definite characters...a well made series
But cancelled after one measly season
Did I leave anything out, anyone?