Category talk:Milestone episodes

Which are exactly the reasons for some episodes being in this category? MH (talk) 00:43, 19 November 2018 (UTC)

I also want to know. Several of the pages listed here don’t provide any explanations. Suggestion: can we maybe make a page listing landmarks with explanations? TheFatPanda (talk) 20:00, 24 July 2019 (UTC)