Firefly - S01 01 - The train job

Mal and his crew are recruited by a greedy and sadistic gangster, named Niska, to pull off an old-fashioned train robbery. Although the heist goes off without a hitch, Mal and Zoe are detained by the authorities only then to learn that the cargo they stole was medicine going to refugees and are torn whether to risk giving back the cargo and not getting payed for the job.