VIDEO: Doctor Who Christmas Special 2017 Trailer

The first trailer for this year's Doctor Who Christmas Special, "Twice Upon a Time," dropped today at San Diego Comic-Con. In what will be the final outing for Peter Capaldi in the role of The Doctor, the episode also features David Bradley as the First Doctor, along with Mark Gatiss and a surprise guest, but you'll see who in the video below. Can't spill all the beans!

That's right! Pearl Mackie is back as Bill Potts, for the Christmas Special at any rate. Can't wait to see how that plays out!

The 13th Doctor is expected to make an appearance as The Doctor regenerates and the show prepares to enter a whole new phase in 2018. Chris Chibnall will take over as showrunner and Jodie Whittaker will become the first woman in the lead role in the 50+ year history of the show.

But before we say goodbye to Peter Capaldi, let's take a look back on the Twelfth Doctor's adventures with this lovely tribute from BBC America.

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