The penultimate episode of the 2011 Doctor Who season. It is a sequel to the 2010 episode "The Lodger", bringing back Craig and Sophie. Clerks close up a contemporary department store at night, complaining of brief power flickers in the lights. One clerk enters the changing rooms, appalled at the mess, but discovers someone still in one of the stalls. She goes to open the door, telling them the store is closing up, but soon lets out a scream...