Love Rat

Captain Jack Harkness is dead, and that's the simplest thing that's happened to him in the last few days. Even the manner of his death is surprisingly complex, especially when it turns out that he hasn't come back alone.

While Torchwood try and cope with a new mayor and a terrorist cell, they also have to deal with what, at first, looks to be a plague, and then turns out to be something far, far worse.