After splitting with the Joker, Harley Quinn joins superheroes Black Canary, Huntress and Renee Montoya to save a young girl from an evil crime lord. (Note: I thought the title of this was "Birds of Prey: And the Fantabulous Emancipation of One Harley Quinn" but according to IMDB it's not?)
Arrow: Legacy Season 5, Ep 1
Oliver has to balance his daytime life as the mayor with his nighttime activities as Green Arrow. A new vigilante comes to town, Quentin returns to town and a new baddie wants to take over the town. Oliver gets to try out a new trick arrow. [more inside]
Arrow: Haunted Season 4, Ep 5
Oliver calls in a favor from old friend John Constantine when things with Sara take a turn for the worse. [more inside]
The Flash: Who Is Harrison Wells? Season 1, Ep 19
Joe and Cisco head to Starling City to continue their investigation of Dr. Wells. While in town, the duo enlists the help of Captain Lance, and Cisco meets the Black Canary, who asks him for a favor. Meanwhile, back in Central City, Barry races to catch a meta-human named Hannibal Bates who can transform himself into every person he touches – which includes Eddie, Iris, Caitlin and even The Flash.