This is one of my favorite historical episodes, and the closest Doctor Who has come in a very long time to a pure historical. Yes, there are aliens present, but other than serving as a red herring they have no effect whatsoever on the events of the story. And yet their presence is beautiful, observing and honoring people who otherwise would have no one to do it. (It's so small compared to the themes here I almost forgot to mention it, but I also enjoy it when scary-looking aliens aren't actually the bad guys)

I love the way the romance, personal feelings, and daily life coexist with the large historical events that are taking place. I love the personal connection to Yaz and her tangible feelings on the matter. All the characters feel real and deep and meaningful. It explains exactly why her family lives in Sheffield now in a very sweet moment.

The whole story is so tragic and lovely I cry every time I watch it, especially at the end when we see Umbreen again in the present day with the added context of her life, but she still hasn't lived a bad life. She's still been happy and loved. This is my ideal serious Doctor Who episode, honestly.