I was aware the series existed but I was never a regular viewer. But something today reminded me of the series and I was checking the Wikipedia article. I hadn’t been aware how long the series was on the air and how complete the cast turnover had been.
The other thing I noticed was that several of the original cast members returned as guest stars in the final season. And I’m curious how they worked it out. Did they intersperse their appearances throughout the final season? Was there one episode where they gathered together all the old characters? Were the characters appearing in the current setting or did they appear in flashback scenes to the earlier setting of the show?