When Harley Quinn Season 4 began, it became clear the series would pivot a lot on the Bat-family. It made sense, given Bruce Wayne went to a jail for elites and Harley signed up to join his charges. However, as the series progressed, it's been clear things have not been smooth sailing at Wayne Manor.
Source：https://www.cbr.com/harley-quinn-season4-batman-666-grant-morrison/
