The Doctor and UNIT investigate Ruby's past. But as the Time Window reveals horrifying secrets from Christmas Eve, the mysterious Triad Technology unleash the greatest evil of all.

From a war-torn Manchester hotel in 1940 to the Orient Express travelling across Italy in 1962, the Doctor is determined to deliver a toasted sandwich and a pumpkin latte. The base camp at Everest in 1953 is also a wrong turn on his travels, but at the Sandringham Hotel in 2024, he meets a single woman called Joy. When she opens a secret doorway to the Time Hotel, Joy discovers danger and dinosaurs. But a deadly plan is unfolding across the Earth, just in time for Christmas. Festive edition of the fantasy saga, starring Ncuti Gatwa and Nicola Coughlan.