Spoiled billionaire playboy Oliver Queen is missing and presumed dead when his yacht is lost at sea. He returns five years later a changed man, determined to clean up the city as a hooded vigilante armed with a bow.
Cast: Stephen Amell, David Ramsey, Willa Holland, Paul Blackthorne, Emily Bett Rickards, Katie Cassidy, John Barrowman
Season 4 ends with Oliver teaming up with a surprising force in an attempt to stop Damien Darhk and his magic once and for all.
Oliver and Diggle race to rescue Thea, while Felicity, Curtis and Noah join together to stop Darhk.
Felicity realizes she needs to ask her father, Noah Kuttler, for help when Team Arrow learns what Damien Darhk's next move is going to be. Meanwhile, Noah and Oliver have a heart-to-heart talk that leaves Oliver rattled.
Oliver and Felicity look for a magical solution to defeat Darhk; vengeance-driven Diggle gets a lead on Andy's whereabouts and heads off to confront his brother; Alex takes Thea on a vacation that quickly turns into a nightmare.
Oliver and the team struggle to come to terms with Laurel's death, especially Diggle, who is overwhelmed with guilt for choosing to believe Andy had changed. Meanwhile, Lance refuses to believe his daughter is dead and asks Nyssa to help bring her back.
Oliver and Diggle learn that Merlyn plans to break Darhk out of prison. Meanwhile, Laurel gets a surprising offer; and Felicity has a heart-to-heart talk with Curtis.
The Bug-Eyed Bandit escapes from jail and turns up at Palmer Tech threatening to kill everyone in the building unless she gets the bio-chip that was implanted in Felicity's spine.
Following the events of William's kidnapping, Darhk has become less powerful, but Carrie Cutter, a.k.a. Cupid, has emerged into Star City to cause chaos on the city and the Green Arrow.
Oliver realizes he needs help battling Darhk so he calls in an old friend – Vixen. Using her magical ability to summon animal powers, Vixen gets a lock on Darhk's location and the team goes to war. Meanwhile, Thea has a heart-to-heart talk with Malcolm.
Oliver and team uncover HIVE's plan to take out Team Arrow once and for all. With HIVE's next attack imminent, Lance wonders if Donna is safer without him in her life. Meanwhile, with the wedding fast approaching, Oliver begins to feel guilty that he hasn't told Felicity about his son.
Oliver receives an offer from Nyssa that is hard to refuse. Meanwhile, Thea continues to battle the blood lust, Malcolm steps in to help his daughter, and Laurel has a heart to heart talk with Nyssa.
The team faces off against a formidable villain nicknamed The Calculator. Meanwhile, Nyssa makes her move and Roy Harper returns to Star City.
Diggle must learn to trust his brother Andy when an enemy of their wartime past, an agent of the criminal organization Shadowspire, pays a visit to Star City. However, Diggle learns more than he bargained for about their shared time at war. Meanwhile, Oliver has to learn a whole new way of life.
Oliver must deal with the devastating consequences of Darhk's last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Darhk.
After the city is attacked again, Oliver makes a bold move against HIVE. Malcolm checks in on Thea and leaves her with a warning. Things take a horrible turn when Damien Darhk retaliates in a brutal manner at Oliver's mayoral holiday party.
Oliver and Barry Allen take Kendra Saunders and Carter Hall to a remote location to keep them hidden from Vandal Savage while they figure out how to defeat him. Malcolm arranges a meeting between Vandal, Green Arrow and The Flash that doesn't go as planned. Meanwhile, Felicity, Thea, Diggle and Laurel work with Team Flash to come up with a weapon powerful enough to destroy Vandal Savage.
A shocking revelation complicates the battle between Team Arrow and Damien Darhk; Thea loses control in front of Alex.
Felicity is frantic when she learns that Ray is alive and being held by Damien Darhk. Felicity's guilt over not finding Ray sooner causes tension between her and Oliver.
Oliver calls in a favor from old friend John Constantine when things with Sara take a turn for the worse.
Laurel must deal with the repercussions of taking Sara to Nanda Parbat. Meanwhile, Oliver asks Captain Lance for a favor and while he's not surprised at the response, he is surprised at what he finds out next.
The growing tension between Oliver and Diggle puts both their lives at risk when they go after Damien Darhk and a H.I.V.E. deployed meta-human. Meanwhile, Laurel talks Thea into returning to Nanda Parbat to ask her father to put Sara into the Lazarus Pit. However, Laurel is surprised when Nyssa refuses to do it.
Oliver and Thea are concerned when a family friend plans to run for mayor; Thea starts to exhibit side effects from the Lazarus Pit; Felicity asks an employee for help with a business decision.
A new enemy lures Oliver Queen back to Starling City and forces him to put on the hood once more.