The next episode to air is The Empty Child which, due to the Eurovision Song Contest, will be shown at the slightly earlier time of 6.20pm
Written by Steven Moffat, creator of Coupling, the episode is set in London, 1941, during the Blitz.
The Doctor and Rose discover a that a mysterious cylinder is being guarded by the army. Meanwhile homeless children, living on the bombsites, are being terrorised by an unearthly child.
Speaking about his episode Moffatt says “Getting involved in the new series was absolutely thrilling, but I guess I took a deep breath before I started writing my episodes.”
“To my mind, Doctor Who should be predominantly scary, but you can’t make it too terrifying if you’re aiming it at a family audience.”
Joining the cast is John Barrowman as time traveller Captain Jack Harkness who describes his character as “a rogue Time Agent”
“But he’s also an intergalactic conman and he starts off by trying to con The Doctor and Rose. He tries to sell them something in order to get money because that’s what he does.”
“He has conned a lot of people in the past. His method is to sell people things that are not what he says”
Also appearing is Richard Wilson as Dr Constantine who is attempting to treat the victims of a plague which has gripped the Albion Hospital in London.
All the patients are suffering the same symptoms – they appear to be dead and their gas masks are fused to their faces.
“Dr Constantine is having a really bad time of it,” says Richard. “He is a good man and really cares about his patients but there’s a limit to what he can do under the circumstances.
“To start off, he thinks the people in the hospital are simply wearing their gas masks – but later it is discovered that the masks have become part of them and have actually morphed onto their faces.
“All the trouble and illness seems to have started after a bomb was dropped. That started everything off – one person became ill and then it spread like a plague.”
Episode 9, The Empty Child, airs on BBC ONE on Saturday 21 May at 6.30pm.