Complete story — includes the ending
Brie Larvan orchestrates her release from prison and travels to Star City in search of the bio-mechanical chip that helps Felicity walk. Brie attacks Palmer Tech, holding the board hostage until Felicity turns herself over. Curtis tracks down Oliver's hideout, discovering his secret in the process, so that he can offer his help to the team to save Felicity, Donna, and Thea. Oliver is stung by one of Brie's robotic bees. Curtis realizes the sting actually implanted a bee within Oliver that is replicating itself. Laurel uses her Canary Cry to save Oliver. Felicity is able to evacuate the board members, while Brie reveals she is after the chip because she has a tumor that is going to leave her paralyzed. Curtis develops a virus to shut down the bees and uses them to stop Brie. Meanwhile, Malcolm visits Darhk and informs him that H.I.V.E. is proceeding with "Genesis" without Darhk, who later gains the loyalty of Michael Amar. Andy is revealed to be still in allegiance with Darhk. In flashbacks, Oliver engages Reiter, whose powers from the idol dwindle; and Reiter escapes into the tunnels to recover it. Oliver and Taiana decide to save the prisoners instead.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Arrow season 4. HTML formatting and reference markers removed. · Content license