Eleven-Fifty-Nine: Andy Diggle tells his brother that he was approached by Malcolm about a plan to break Darhk out of prison. Oliver and Diggle foil H.I.V.E.’s plan, but it turns out to be a ruse designed to let Malcolm and his League followers invade the bunker and steal Darhk’s idol. The team attempts to locate Malcolm with Andy providing intel. Malcolm delivers the idol to Darhk, but it will not work because it is incomplete. Diggle reveals to Andy that he personally hid the missing piece in another location. Oliver does not trust Andy and confronts him; Diggle interrupts the interrogation and sides with his brother. Darhk orchestrates a prison riot and the team sets out to stop him with Andy joining them. However, when the team reaches Darhk, Andy turns on them and gives Darhk the missing piece to his idol. With his powers restored, Darhk stabs Laurel as revenge upon Captain Lance before escaping with Malcolm, Andy, and several inmates. Laurel later dies at the hospital. In flashbacks, Oliver helps the island prisoners escape and sets off a bomb to bury Reiter and keep him from leaving the tunnels.
Canary Cry: As the team mourns Laurel’s death and tries to determine their next move against Darhk, there is a sighting of the Black Canary stopping an illegal weapons exchange. Oliver discovers that Laurel’s sonic device is missing from her belongings from the hospital. The imposter turns out to be a H.I.V.E. prisoner named Evelyn Sharp whom Oliver left behind after he saved his team when they were kidnapped by Darhk, believing that she was with Darhk voluntarily. Captain Lance looks for a way to resurrect Laurel, even soliciting Nyssa al Ghul for help. Diggle, angry at being betrayed by Andy, goes after Darhk’s wife, Ruvé Adams, but Oliver intervenes to prevent him from doing something he would regret. As a result, Ruvé uses her mayoral authority to issue arrest warrants for all vigilantes. Sharp goes after Ruvé publicly, but Oliver is able to talk her out of killing the Mayor. At Laurel’s funeral, Oliver reveals Laurel as the Black Canary to preserve her image with the city. Afterwards, Oliver vows to kill Darhk. In flashbacks, Oliver and Laurel struggle to come to terms with Tommy Merlyn’s death. In the end, Oliver leaves Laurel to cope on her own, and returns to the island of Lian Yu.
Genesis: Darhk returns to H.I.V.E. and kills the remaining board members before renewing his plans for “Genesis”. Oliver and Felicity meet an immortal shaman, Fortuna, who educates Oliver about dark magic. Fortuna explains that Darhk’s idol channels darkness and death, feeding him more power, but there is an opposing force that channels light and hope. After a mystical ritual, Fortuna tells Oliver that the darkness inside him is too strong to channel the light. In Star City, Diggle locates Andy, but is captured after a brief shootout. Andy puts a tracking device on him, then allows Diggle to escape so that Darhk and his team can go after Diggle, Lyla, their daughter, and steal the “Rubicon” to the world’s nuclear weapons. Oliver manages to stop Darhk by channeling the power of light, nullifying Darhk’s powers and forcing him to retreat. Diggle and Andy battle again, with Diggle ultimately killing his brother. Thea is taken by H.I.V.E. to a secret underground city. The team realizes that Darhk plans to detonate nuclear weapons and build a new world over the ashes.
Monument Point: Darhk begins taking control over the world’s nuclear missles. The team seeks out Felicity’s father, Noah, to help disable the “Rubicon” program. Darhk sends Danny Brickwell and Michael Amar to find and kill Noah, but Oliver and his team are able to rescue him from Darhk’s men. Noah agrees to help, but requires a high-powered processor from Palmer Tech. Felicity learns she has been fired as CEO and is unable to get the processor, forcing the team to break in and steal it. H.I.V.E. locates the team when Noah hacks into “Rubicon”. As H.I.V.E. attacks, Felicity and her father shut down “Rubicon” and stop all missiles but one, which launches and heads to Monument Point. Felicity can only redirect it to a less populated town, where it detonates. Oliver and Diggle find Darhk in a nexus chamber, gathering more power from all the deaths caused by the explosion. In flashbacks, Reiter escapes the caves, but Oliver and Taiana steal the idol again. The idol soon begins to affect Taiana.