Complete story — includes the ending
Darhk's power has grown exponentially and he attempts to reactivate "Rubicon" with the help of Felicity's former boyfriend, Cooper Seldon, and launch the remaining missiles. However, Noah, Felicity, and Curtis successfully shut down "Rubicon" for good. Meanwhile, Oliver and Diggle discover the underground town and track Thea's whereabouts. Malcolm uses a mind-controlling drug on her which makes her turn on Oliver, but Oliver manages to talk her back to reality. Just then, Machin takes over H.I.V.E.'s command center and threatens to destroy Darhk's town. Oliver, Diggle, and Thea intercede, but the main power source gets ruptured and explodes, destroying the city. The town is evacuated and Machin escapes, but not before killing Ruvé. Donna convinces Noah to leave and never come back. Darhk decides to use "Rubicon" to destroy the whole Earth and shows up at Oliver's home, where Felicity, Donna, and Curtis are. In flashbacks, the idol begins to slowly corrupt Taiana, feeding her ever more power from each soldier she and Oliver kill. Oliver takes the idol and tries to talk her down, but Reiter suddenly arrives and confronts them both.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Arrow season 4. HTML formatting and reference markers removed. · Content license