Warning: This article contains spoilers for Harley Quinn Season 5, Episode 10.I loved how Harley Quinn season 5 ended. The DC series built up Brainiac throughout the season, leading to his (albeit surprising) actions in the finale making sense. In episode 9, the show set the stage for the finale, with the characters divided into two groups. I enjoyed that, and for a significant portion of the finale, we got to see the same dynamics play out. Only Harley Quinn and Poison Ivy’s team managed to succeed this time around and defeat both Lena Luthor and her brother, Lex.