 " Blink " is the tenth episode of the third series of the British science fiction television series Doctor Who . It was first broadcast on 9 June 2007 on the British Broadcasting Corporation ( BBC ) . The episode was directed by Hettie MacDonald and is the only episode in the 2007 series written by Steven Moffat . The episode is based on a previous short story written by Moffat for the 2006 Doctor Who Annual , entitled " ' What I Did on My Christmas Holidays ' By Sally Sparrow " . 
