Last time on Arrow was another major moment in the show's ongoing story plot. As the Black Canary was finally leaving behind the events of the Brick war, the villain Vertigo made a comeback. That time, claiming the black-costumed heroine as a victim of his fear toxin, which caused her to see illusions of her sister Sara Lance (also known as "Canary") attacking her with a bitter and angry attitude, except of course it was Vertigo assaulting her in reality.
Fortunately, Black Canary overcame her fear of angering her sister and about an attempt to take over her fighting spirit and learned to build her own fighting spirit in time to defeat the villain himself.
Meanwhile, Oliver Queen faced another major moment in his life with family as he invited his half sister Thea to discover his double-life, which fortunately brought them closer together, but unfortunately resulted Thea's bitterness towards Malcolm Merlyn, who thought he did right by keeping Arrow's secret away from her after the Deathstroke terror in Starling City back in season 2. And now, we look at another major moment in Arrow's life in the Arrow episode "The Return".