When a London bus takes a detour to an alien world, the Doctor must join forces with the extraordinary Lady Christina. But the mysterious planet holds terrifying secrets, hidden in the sand. And time is running out, as the deadly Swarm gets closer…

David Tennant interview

Q: Has filming the specials been different from filming the regular series?

I think we get slightly more time to film the specials. I don’t know if that’s even true – we get four weeks to film an hour long special whereas we get about two and a half weeks to film a normal 45 minute episode. So we’ve got a little bit more time to play with but then they tend to be a bit more ambitious. Certainly this one was, and you know the fact that we wanted to film in an actual desert and there aren’t a lot of them in south Wales. So we had to find somewhere in the world that we could get to that had an infrastructure that we could use to film in and that would have us, you know. Some of these deserts exist in some less than friendly regimes. Some might argue that Dubai’s not the friendliest but they were quite nice to us.

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