The series portrayed an outlawed crew flying through space continuing to rebel against the Alliance. This was the superpower control group that governed the Allied Planets. There were nine crewmen on the "Serenity" which was the name of the firefly class ship that was home to the crew. The world was created with the premise that China and the United States were the last to controlling nations so therefor everyone in the future worlds spoke a mix of English and Chinese. This of course made for some hilarious moments on the show.
The humor mixed into the future worlds that were sometimes stuck in the past made for a great show where anything could happen and it often did. A friend got me addicted and I got my family addicted and now I encourage you to check it out. Even Dr. Sheldon Cooper from Big Bang Theory liked the show. :D
Enjoy some of my favorite quotes from the Series and Movie.
Mal: "Someone ever tries to kill you, you try to kill 'em right back!"
Wash: "Curse your sudden but inevitable betrayal!"
Mal to Jayne: "Well, my time of not taking you seriously is coming to a middle."
Jayne: "You know what the chain of command is? It's the chain I go get and beat you with 'til ya understand who's in ruttin' command here."