Oops. Sorry, didn't mean to spoil you. But since I have ... they didn't kill everyone off. That icon is of Jack, Suzie, Owen, and Toshiko. Suzie died in series one, episodes one and eight. Owen died in series two, episodes six and thirteen. Toshiko died in series two, episode thirteen. Going into series three, Torchwood Cardiff is Jack, Ianto, and Gwen.

And you know it's science fiction because two thirds of the fallen members had to die twice before it took.