 A second prequel , titled " <unk> <unk> " , was released online on 17 December 2012 . At the end of a case , <unk> and Jenny <unk> with an officer from Scotland Yard and <unk> for <unk> 's violent wishes for the <unk> 's punishment . <unk> explains <unk> 's alien origin as well as her own to the officer , much to his <unk> . <unk> reveals that she was <unk> by an extension to the London Underground and initially disliked humans , though that changed when she fell in love with Jenny . On the carriage ride home , Jenny notices it is beginning to snow and <unk> notes that the snow should be impossible because there are no clouds in the sky . 
