The BBC has released their press pack for next week's Christmas special, "The Snowmen", and here are some key hints from Steven Moffat:
The Christmas episode is Doctor Who, only more so, and this year we're going for more epic. The Doctor, when we meet him, isn't in a good place. A bit like when we first encountered William Hartnell as the Doctor in 1963 - or indeed Christopher Eccleston in 2005 - this a cold and withdrawn Time Lord, wanting no part of the world around him. It's going to take a lot of Christmas spirit to get him back out those TARDIS doors.
This episode welcomes Jenna-Louise Coleman. What can you tell us about her character?
It's going to quite a journey of discovery with Jenna and her character - and it doesn't start here, it starts on Christmas day. For now, enough to say, that the Doctor in his darkest hour, long ago in a Victorian winter meets the exactly the right person. Or does he?
And new companion Jenna-Louise Coleman discusses her character Clara, who according to this first meets the Doctor while working as a barmaid at the possibly significantly named Rose and Crown pub, then starts following him:
"She is from the Victorian era and a mysterious one. Very down to earth, but feisty and curious too with numerous jobs. He has the answers to her questions. She isn't intimidated by the Doctor. Instead, she finds him amazing and ridiculous. But she is on her own mission and lives by her own means. She is very resourceful."
And finally here's a hint from guest star Tom Ward about his character, Captain Latimer:
"He hasn't been used to dealing with his children. He wants to love them, but he is an old naval captain that has struggled to build a relationship."