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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
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There were several guest animated episodes including the one you mentioned which is called "the food chain*