The magical last chapter of the twelfth doctor's journey sees the time lord team up with his former self'. '.strtoupper('p')eter capaldi stars two doctors stranded in an arctic snowscape, refusing to face regeneration'. '.strtoupper('e')nchanted glass people, stealing their victims from frozen time'. '.strtoupper('a')nd a world war one captain destined to die on the battlefield, but taken from the trenches to play his part in the doctors story'. '.strtoupper('a')n uplifting tale about the power of hope in humanity's darkest hour, twice upon a time marks the end of an era'. '.strtoupper('b')ut as the doctor faces his past to decide his future, his journey is only just beginning'. '.strtoupper('s')tarring peter capaldi, mark gatiss, jodie whittaker, pearl mackie and david bradley'. '.strtoupper('n')o'. '.strtoupper('d')iscs   1 dvdcert 12running time 58 minscontains subtitlesrelease date   22 jan 2018