Not only does this new BBC America series feature a former Doctor, it also features a former companion. We would say that Arthur Darvill and David Tennant are reuniting for the show, but that's not quite the case. Darvill and Tennant may both have been on "Who," but not at the same time. Darvill, as you know, showed with Matt Smith's Doctor. But, enough of that, let us tell you about this show -- it's all about the murder of a young boy and the fallout from said murder. Olivia Colman and Vicky McClure also star.