With Amazon’s alternative reality series, The Man in the High Castle, now in its third season, BBC One is getting set to air its own look at a “what-if” scenario arising from WWII. According to Wikipedia, SS-GB is a 2017 British drama series produced for the BBC and based on the 1978 novel of the same name by Len Deighton. It is set in a 1941 alternative timeline in which the United Kingdom is occupied by Nazi Germany, having won the Battle of Britain.