Weeping Angels

"Don't blink. Don't even blink. Blink and you're dead. They are fast, faster than you can believe. Don't turn your back, don't look away, and don't blink"

Known as “The Lonely Assassins”, the Weeping Angels are quantum-locked alien killers, as old as the universe itself. Little is known of their origins or culture. When observed, they freeze like stone, but in the blink of an eye they can move vast distances. The touch of an Angel hurls their victim back in time – allowing the Angel to feast on the energy of their unlived days. Initially, the Tenth Doctor encountered four Angels, who sent him back to 1969. He left clues for Sally Sparrow to find and help trap them – releasing him and the TARDIS. Later encounters have seen a whole mausoleum of statues, tiny cherubs and even the Statue of Liberty transformed into Weeping Angels. Both Amy and Rory were trapped by a Weeping Angel, when it sent them back to 1938 to live out their lives together.

During the Flux, the Thirteenth Doctor's TARDIS was hijacked by a rogue Angel on the run from Division. Taking refuge inside the mind of Claire Brown, the rogue Angel asked for the Doctor's help in escaping an Extraction Squad of its own kind that had taken the village of Medderton out of time and space in order to capture it. After failing to escape the Extraction Squad, the Doctor was transformed into a Weeping Angel in order to be transported outside of the universe, to Division.