When children across the world simultaneously succumb to a powerful trance and chant "we are coming", you know these are the symptoms of a supernatural invasion. Hence, the very premise of the third season of BBC America's sci-fi series, Torchwood: Children of Earth, is bound to attract audiences fascinated with doomsday scenarios. Premiering in July, below is the teaser trailer for the new season, which should hopefully attract some more fans to the series that is already a major hit.