Torchwood writer John Fay took part in a live web chat earlier this week, and discussed his work on the new series of the programme.
Fay, who wrote two episodes of 'Children of Earth', revealed that he has scripted Episode 9 of the ten-part 'Miracle Day': "How many eps? Just the one. Episode Nine of ten. I can tell you a lot of my ep is set in Wales, and has already been shot."
Answering a query regarding the tone of Series 4, the writer commented: "Russell and Julie Gardner remain in charge, so I think it'll still have the same basic tone. There are more American characters in it, so obviously it'll probably feel more American."
Torchwood: Miracle Day is currently in production and will be broadcast on BBC One and Starz in the Summer.