Description：The story takes place in the distant future, when human exploration of space has developed to a mature stage. Mel (Nathan Fillion) is the captain of the spaceship Serenity. Every day, Mel drives his "home" through the vast universe. Serenity has nine passengers, each of whom has a very different status and personality. Each of them has an unspeakable dark past, and they have their own reasons for leaving the land and boarding Serenity. The only thing the nine people have in common is that they are all "thorns" in the world above. In order to make a living, Serenity accepts all missions that can make money, some of which do not even seem so legal. At the same time, Captain Mel also has to lead his crew to try to escape the United Nations.