Firefly - Season 1, Episode 11: Serenity Part 1 + Part 2
Trailer
Fleeing from the corrupted and oppressed world, a group of war veterans by the company of Malcolm, who is known as Mal, as he has a small space vehicle, by which they manage to wander the universe, searching for the living sources, but their life turns down, upon losing their way in such a weird galaxy, shocking by what they see, the thing that makes their fear and worry.