"Firefly" had an ensemble cast that played the nine crew members of the ship, "Serenity". These characters fight criminals, Alliance security forces, the insane Reavers, and the mysterious men with "hands of blue" - who seem to work for a secret agency which is part of the huge corporation, The Blue Sun Corporation. The crew needs to get enough income to keep their ship working. While doing this, they must stay hidden from people looking for them.