BBC America released another trailer for the highly-anticipated “Doctor Who Christmas Special” this morning. While the event is usually a festive adventure filled with surprise guest-stars, this year’s episode will be bittersweet. Whovians will have to say goodbye to Peter Capaldi in the episode, but in turn, will be saying hello to the brand new Doctor taking center stage in the new year.

This year’s Doctor Who Christmas Special is titled “Twice Upon A Time,” and the episode will premiere on Christmas Day at 9/8c on BBC America. The special episode will star Peter Capaldi as the Doctor, David Bradley as the First Doctor, Pearl Mackie as Bill Potts, and Mark Gatiss as the Captain. As we mentioned earlier, the special event will see Peter Capaldi’s Doctor regenerate into the Thirteenth Doctor, played by Jodie Whittaker.

That’s not the only Doctor Who content that BBC America has planned for fans, immediately following Twice Upon A Time the network will premiere the all-new special “Doctor Who: Farewell to Peter Capaldi”. That event will be narrated by actor Colin McFarlane (The Dark Knight, Doctor Who), the episode, featuring archive footage and interviews, looks back at Peter Capaldi’s era as the Twelfth Doctor – from his very first script read through to his very last. It also features Steven Moffat reflecting upon his time as a writer and then later as Executive Producer, revealing some of his best and worst moments from his tenure, as well as his favorite episodes. Fans of Doctor Who can watch the latest trailer for the special below, and be sure to tune-in on Christmas day to celebrate Capaldi’s final performance as the Doctor.

But wait, there’s more! Starting Tuesday, December 19, BBC America will air a 7-day, 24-hour full takeover marathon featuring Doctor Who episodes with David Tennant, Matt Smith and Peter Capaldi.