Here is the latest for the Doctor Who fans (commonly known as Whovians). Professor River Song (Alex Kingston) is coming back to the show for the Christmas special . The doctor and his wife had a twisted relationship in terms of timelines. River and the Doctor crossed paths but River's life went in reverse. The first time fans saw her was with the tenth doctor played by David Tenant, who had absolutely no idea who River was, while she knew all about him. She then died in the same meeting to help the Doctor escape. She connected herself to a computer network and dissipated into data.

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Later on, viewers saw the younger version of her, as the mystery unfolded about who she really was. Lately, she was seen with the eleventh Doctor (Matt Smith) but she was just a fragment of his imagination. She had already been dead. So the real question is how is she coming back?

"The last time the Doctor saw her she was a ghost. The first time he met her, she died. So how can he be seeing her again? As ever, with the most complicated relationship of the universe, it's a matter of time," stated executive producer Steven Moffat.

Well, there is no extent to surprises with this series. Beside time travel can be a bit confusing. What would be interesting is to see how the creators twist the story and fit River in. She could still be a ghost. Maybe The Doctor and Clara run into a younger version of River during one of their ventures. Whatever version that she comes in, it will definitely be a real treat. There is no word on whether she will be back for more episodes or just the Christmas special. This will be the first time River Song will be meeting the twelfth Doctor (Peter Capadali). The fans can keep on speculating till Christmas. The series 9 will premiere on Sept. 19.

TagsDoctor Who, Season 9, christmas special