Other new faces will soon enter the fray including Lauren Ambrose (Six Feet Under), Arlene Tur (Crash), Candace Brown (Head Case), and Dichen Lachman (Dollhouse, Neighbours). All of these are complete unknowns. Which is fine. Torchwood works best when the surprises come fast and furious.
One question that hangs in the air, and will not be answered anytime soon, is, what becomes of Torchwood after this crisis? Both seasons two and three end fairly definitively, with the institute suffering heavy loss. Gwen clearly isn't happy in an isolated house. It seems unlikely she will be willing to go back there. Presumably Jack will survive. Could Miracle Day by the beginning of a whole new series, with a large ensemble besides the duo? Or will it be a ten episode adventure that ends with Torchwood still defunct? The former is the better option.
Watch Torchwood Friday nights at 10 p.m. ET on Starz.