Doctor Who: Twice Upon a Time

2017 Christmas special of the long-running BBC sci-fi show starring Peter Capaldi as the Twelfth Doctor.

In this instalment, the Doctor embarks upon an adventure with the First Doctor (David Bradley) and, while refusing to regenerate, the pair find themselves trying to help a First World War British Army captain (Mark Gatiss) who has become displaced in time and ended up at the South Pole with the Time Lords.

After they are all abducted by a spaceship, the trio find themselves facing a new threat before the life of the Twelfth Doctor comes to an end and the Thirteenth Doctor (Jodie Whittaker) makes her first appearance.