defining non-serial television as fictional work not intended to watch in a sequential order for narrative reasons.
often these will be 'self-contained' shows ie. work whose narrative begins and ends in 1 episode.
some of these shows may have character carry-overs or thematic relationships from episode to episode.
i have omitted 'strands' ie. Play For Today or BBC Shakespeare
this will naturally favour comedic television but some dramas will be included.

1 Dekalog (1988)
if there is a problem with this is that it peaks in the middle with two of the greatest back-to-back episodes of television ever made. loosely-themed around the ten commandments but i suggest that that is a macguffin and possibly just a way to approach ten different stories about people in a warsaw apartment block. essentially there's nothing 'new' about dekalog: these are morality tales with turns and twists, but they're rendered with such skill and tenderness and just enough opacity.

2 The Simpsons (1989-)
it is easy to be jaded with this show as it hasn't been good for much longer than it has been good. however, the first 9 series comprises about 150 episodes that are, at the very least, 'really good', with some of those best-in-class in the world of animated episodic television. changed television completely.