Supernatural's Mark Sheppard to guest-star on Doctor Who!

Seems like Mark Sheppard is in every Sci-Fi series to hit television these days. From Battlestar: Galactica, Chuck, Warehouse 13 and most recently as the demon Crawley on Supernatural.

Now word is that Sheppard is guest-starring on the upcoming series 6 of Doctor Who; it's believed he will appear in the two-parter series opener penned by Steven Moffat that will have the cast and crew partly filming the episode in the US this November.