Students Hayley and James are young and in love. After saying goodbye for Christmas at a London train station, they both make the same mad split-second decision to swap trains and surprise each other. Passing each other in the station, they are completely unaware that they have just swapped Christmases.
The Doctor and Clara face their Last Christmas. Trapped on an Arctic base, under attack from terrifying creatures, who are you going to call? Santa Claus!
Hairdresser Maria is fixated by The Sound of Music - it was the film she saw the night she was jilted 18 years ago. In a bid to confront her demons, Maria decides to travel to Salzburg, but with her mother and teenage offspring in tow she gets more than she bargained for.
