The underdogs don't seem to be winning too many matches in this long-running series.

That much you would expect from a long-running series.

There are plenty of good reasons for disliking final seasons or final episodes, particularly at the end of a long-running series.

But he had taken too literally the possessive in the long-running series' title.

Often the best episodes of a long-running series are the ones that break with the formula.