World's Finest
Caroline Dries, the fabulous creative force behind Batwoman and TVD has an interview with comicbook.com that posted yesterday (5/11). She hopes they can do the World's Finest crossover with Supergirl next season. She very purposely chose kryptonite as a bat suit vulnerability (revealed in its penultimate episode) to further build on the Kate/Kara relationship.
https://comicbook.com/tv-shows/amp/news/batwoman-spoilers-episode-19-kryptonite-supergirl-crossover/