Complete story — includes the ending
Malcolm joins Darhk, Ruvé, and the other leaders of H.I.V.E. and it is revealed that they are moving on to "Phase 5" of their plan. Darhk sends a group of mercenaries, known as the Demolition Team, to take out Quentin, whom Laurel saves. With Curtis' help, Felicity realizes that the Demolition Team is planning to destroy the building of the mayoral debate between Oliver and Ruvé, leaving her alive as a sympathetic survivor. Oliver and his team stop the mercenaries in time for Oliver to win the debate. Oliver and Felicity become engaged and Curtis gives her a device that can cure her paralysis. Darhk kidnaps William. Meanwhile, Thea finds out about William and supports Oliver's decision to hide it from Felicity. Quentin tells Donna about his previous involvement with Darhk. In flashbacks, in order to gain the approval of the prisoners, Oliver kills Conklin, who reveals that Reiter plans to kill all the prisoners after he finds his "ultimate power".
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Arrow season 4. HTML formatting and reference markers removed. · Content license