Firefly: Serenity (2) is on right now on SciFi:

“Firefly.” Joss Whedon’s underappreciated, and certainly underviewed, 2002 sci-fi series gets an encore run on the Sci-Fi Channel beginning tonight. Some episodes won’t be encores, but rather “originals” because Fox didn’t broadcast all the shows before canceling the series. Nathan Fillion stars as the captain of a crew of misfits in a futuristic world that feels a lot like a space-bound Western. Morena Baccarin co-stars. With this series preceding runs of “Stargate SG-1,” “Stargate Atlantis” and “Battlestar Galactica,” SCIFI is shaping up as the destination for Fridays.

Why they are starting at the end of the regular broadcasts, rather than the beginning, escapes me.