The Doctor returns Rose to her own time - well, sort of - but her family reunion is ruined when a spaceship crashes in the middle of London. What is the origin of the spaceship, and where has the Prime Minister gone in this time of crisis?
Stars: Christopher Eccleston, Billie Piper, Camille Coduri
Director(s): Keith Boak
Writer(s): Russell T. Davies, Steven Moffat, Sydney Newman