Arrow: The Dragon Season 6, Ep 19
Diaz picks a fight with with a powerful crime syndicate and drags Laurel along for back-up. Felicity and Curtis get back to work on Helix. Oliver continues to prove he's being a clueless idiot.
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.