Five hundred years in the future, the crew of the Firefly-class spaceship, Serenity, is eager to stake a claim on the action. They'll take any job, legal or illegal, to keep fuel in the tanks and food on the table. But things get a bit more complicated after they take on a passenger wanted by the new totalitarian Alliance regime. Now they find themselves on the run, desperate to steer clear of Alliance ships and the flesh-eating Reavers who live on the fringes of space.