Doctor Who: Smile

The Doctor and Bill find themselves in a gleaming, perfect city in the far future, at the edge of the galaxy. This new settlement is said to hold the secret of human happiness, but when the pair try to make contact with the locals, all they find are piles of grinning skulls. As the Time Lord and his new travelling pal seek to solve the terrifying mystery, a sinister force stirs within the walls, and from the shadows the cute but deadly emojibots are watching. Guest starring Ralf Little, with Matt Lucas as Nardole