Masterpiece Theatre When originally aired in Great Britain, the first two seasons of "Upstairs, Downstairs" consisted of 13 episodes in each season. For the broadcast of Season One on "Masterpiece Theatre", the original first two British seasons wer... (more)e conflated into a single season of 13 episodes. The other 13 episodes came to be know as "The Missing Episodes", and were eventually shown under that banner in the late 1980's. In the first episode: Sarah, a new under-house parlor maid, arrives at 165 Eaton Place with only vague and unverifiable French references. Lady Marjorie is intrigued; however the downstairs staff are skeptical and less than pleased with her pretensions, her distaste for hard work, and her lack of discipline. Originally aired in the UK as Season 1, Episode 1