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!
It tells the story of how Octavio and Adela were born on the same day: 14 April 1931, but in opposing families. Over the next 90 years their lives will intertwine, through intense encounters and misunderstandings, in eight episodes told in sequence shots.
When Danny, a guilt-ridden engineering geologist in transit to her remote Russian assignment survives a mysterious helicopter crash, she must try to escape the harsh environment. But she is not alone.