"Lux" was one of the episodes that I was most excited for this season, and it did not disappoint! I adored the mixing of animation and live action. Alan Cumming was fantastic as Mr. Ring a Ding! My mother and I audibly gasped when he did the giggle and the letters on the marquee rearranged to spell harbinger. I got really emotional while watching the scene with the fans (shoutout to Bronté Barbé for being fabulous in both the recent off-West End production of Newsies and this episode) when the music from Matt Smith's era was played. So far, "Lux" is my favorite episode of the RTD2 era.

Edit: after rewatching "Wild Blue Yonder," I realized that's actually my favorite RTD2 era episode.