 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".In the episode, the Tenth Doctor—a time travelling alien played by David Tennant—is trapped in 1969 and tries to communicate with a young woman in 2007, Sally Sparrow (Carey Mulligan), to prevent the statue-like Weeping Angels from taking control of the TARDIS.