Overview:Confidential goes behind the scenes for the epic series finale set on the asteroid, Demons Run. We discover how the Doctor Who team create the newest baddies, turn a small platoon of clerics into an army and transform an alley in Cardiff into Jack the Ripper's London. Features a day in the life of a Doctor Who enemy and in-depth interviews with Karen Gillan, Arthur Darvill, Alex Kingston, Frances Barber and lead writer Steven Moffat.