Weeping Angel
Weeping Angels were creatures who appeared as a statue of an angel, and could not move when observed by another living being. They were dangerous predators who “killed” their victims by sending them into the past and feeding on the energy of the life they would have lived in the present.
History
In one universe, where the Doctor coexisted with the Addams Family, Weeping Angels were known on Earth by the 21st century, at least to “Outcasts”, with a succinct document describing them being available in the Nightshades' secret library at Nevermore Academy. One such Weeping Angel encountered Wednesday Addams and, detecting that she was a complicated space-time event, attempted to feed on her. It was thwarted by the sudden arrival of Marilyn Thornhill. (PROSE: Wednesday and the Weeping Angel)
The Eleventh Doctor later attempted to track down the Angel by following its energy signature. (PROSE: Wednesday and the Doctor)
Behind the scenes
Weeping Angels are recurring antagonists in the BBC science fiction series Doctor Who. They were created by Steven Moffat and made their debut in the 2007 episode Blink.