In a surprising twist, the thing Whovians have been clamoring about for years will actually be happening on "Doctor Who" after Season 9!

According to Doctor Who TV, actress Alex Kingston begins filming the 2015 "Doctor Who" Christmas special this week, which will mark her grand return and her first encounter with Peter Capaldi's version of the Doctor. Reportedly, the episode is written by executive producer Steven Moffat and directed by "Doctor Who" staple Douglas Mackinnon.

"To be honest, I did not know whether River would ever return to the show, but here she is, back with the Doctor for the Christmas special," said Kingston.

"Steven Moffat is on glittering form, giving us an episode filled with humor and surprise guest castings. I met Peter for the first time at Monday's read through, we had a laugh, and I am now excited and ready to start filming with him and the Doctor Who team. Christmas in September? Why not!"

But how will River Song figure into "Doctor Who" after Season 9?

Last month, set photos from the "Doctor Who" Season 9 finale revealed that Eddie's Diner would be a featured location once again after "The Impossible Astronaut." The astronaut in question, of course, is River Song. Does this mean the "Doctor Who" Season 9 finale will revisit this timeline? After all, Clara is the "Impossible Girl."

In the latest issue of SFX Magazine, executive producer Steven Moffat revealed spoilers on every episode of Season 9, but he had little to say about the finale, except to call it "a challenge."

"I won't say anything else because it would be too spoiler-y, but when you'll watch it, you're going to ask how exactly the Doctor and Clara are going to pull it off," said Moffat according to Doctor Who TV.

Will the "Doctor Who" Season 9 finale set up River Song's return by altering that timeline? Stay tuned for more updates!