When the city sleeps, the dead start to walk...Something has sealed off Cardiff, and living corpses are stalking the streets, leaving a trail of half-eaten bodies. Animals are butchered. A young couple in their car never reach their home. A stolen yacht is brought back to shore, carrying only human remains. And a couple of girls heading back from the pub watch the mysterious drivers of a big black SUV take over a crime scene.Torchwood have to deal with the intangible barrier surrounding Cardiff, and some unidentified space debris that seems to be regenerating itself. Plus, of course, the all-night zombie horror show.Not that they really believe in zombies.Featuring Captain Jack Harkness as played by John Barrowman, with Gwen Cooper and Ianto Jones as played by Eve Myles and Gareth David-Lloyd, in the hit science fiction series created by Russell T Davies for BBC Television.