We had just booked Mark’s airline tickets a week ago when less than 12 hours later he got the dream job of any kid who grew up in England-and many kids here too. He landed a huge role in the new Dr. Who but they needed him there the next day. There was no way we were going to stand in the way of that and so Mark took the job but with his deepest apologies. We will try to work out an appearance with him in the future and wish him great luck with Dr. Who!As the release states his start last week, this suggests that he will feature in the series opening two-parter, which began shooting this week under the helm of director Toby Haynes.
Sheppard has appeared in a number of high profile science-fiction shows of late, including Supernatural as Crowley, Battlestar Galactica as Romo Lampkin, and Warehouse 13 as Benedict Valda.