The official preview screening of Peter Capaldi’s Doctor Who swansong, Twice Upon A Time, took place in London last night. Reviews so far have been incredibly strong for the episode. That said, the ending was lopped off, so Jodie Whittaker’s debut in the role remains under wraps until Christmas day.

The BBC has released a slightly updated synopsis for the episode, and it reads as follows…

Two Doctors stranded in a forbidding snowscape, refusing to face regeneration. A British army captain, seemingly destined to die in the First World War but taken from the trenches to play his part in theDoctor’s story. In the final chapter of the Twelfth Doctor’s epic adventure, he must face his past to decide his future. Along the way he realises the resilience of humanity, discovering hope in his darkest frozen moment. It is the end of an era, but the Doctor’s journey is only just beginning.

Twice Upon A Time screens on December 25th at 5.30pm