When the Sixth Doctor goes sight-seeing on Lucidus Silvara, he finds himself in a place where nothing is visible at all… only all-encompassing light! The Tenth Doctor is drawn in by a temporal anomaly, and the two Doctors meet a species with no sense of sight, living in a city surrounded by Weeping Angels.

To save a civilisation, the Doctors must keep their eyes on the Angels. Don’t blink. Don’t even wink.