Millennium Shock is a BBC Books original novel written by Justin Richards and based on the long-running British science fiction television series Doctor Who. It features the Fourth Doctor and Harry, and is a sequel to Richards' Virgin Missing Adventures novel System Shock.
In 1999, the Doctor and Harry deal with a plot by the Voracians – hybrids of alien reptiles and malevolent office equipment – to take advantage of the Y2K problem to conquer the Earth.