Uh, now I just have to watch the series.
If you want to download to your 'puter. Here are the links:
http://movies.apple.com/movies/universal/serenity/serenity_m480.mov
http://movies.apple.com/movies/universal/serenity/serenity_m320.mov
http://movies.apple.com/movies/universal/serenity/serenity_m240.mov