ARSENAL RETURNS TO HELP THE TEAM — When they learn of an upcoming attack on the city, Team Arrow calls Roy Harper (Colton Haynes) to help them stop the Ninth Circle.  However, things go awry and there is massive collateral damage.  As Captain of the SCPD, Dinah (Juliana Harkavy) investigates what happened in an episode that takes on a true crime narrative and tone.       Tara Miele directed the episode written by Onalee Hunter Hughes & Emilio Ortega Aldrich (#720). Original airdate: Monday, April 29th, 2019