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The Best TV Shows finales (Biggest positive difference between average season ratings and finale)
(files.catbox.moe)
Interactive version: https://public.tableau.com/app/profile/bo.mccready8742/viz/TheBestTVShowFinalesDataPlusTV/BestTVShowFinales
Source: https://reddit.com/comments/1f42jj3
Feel free to have a look at !showsandmovies@lemm.ee for a shows oriented community
Which TNG episode is that really poorly rated one roughly 30% into the run?
EDIT: From the looks of the graph, it's the season 2 finale. And when reading up on that episode, it's a clip show hacked together to save on money, due to earlier episodes having gone over budget.
https://en.m.wikipedia.org/wiki/Shades_of_Gray_(Star_Trek:_The_Next_Generation)
"Shades of Gray" is widely reviled as the worst-ever Next Gen episode, with good reason. This isn't an episode that makes anyone look good, and I don't just mean Pulaski, Troi or LaForge – I mean the writers, director and producers of the series. Even Marina Sirtis and Diana Muldaur seem to be trying too hard to make the paper-thin storyline work, over-emoting and making absurd faces. The only person who deserves any kudos is Jonathan Frakes, who somehow manages to keep Riker his usual charming self."