"The Time of Angels" is the fourth episode in the fifth series of British science fiction television series Doctor Who, first broadcast on 24 April 2010 on BBC One. It is the first episode of a two-part story written by showrunner Steven Moffat and directed by Adam Smith; the second episode was "Flesh and Stone". Moffat utilised the two-part episode to bring back a couple of his previous creations: the Weeping Angels from his series three episode "Blink", and River Song (Alex Kingston) from the series four episodes "Silence in the Library" and "Forest of the Dead". The episode is partly set in the 51st century.