Oliver and Diggle learn that Merlyn is going to try to break Darhk out of prison. Meanwhile, Laurel gets a surprising offer and Felicity has a heart-to-heart talk with Curtis.

Brie Larvan breaks out of jail and turns up at Palmer Tech threatening to kill everyone unless she gets the bio-chip that is implanted in Felicity’s spine. When Oliver realizes that Felicity, Thea and Donna are trapped in Palmer Tech with everyone else, he looks to a surprising ally to help Team Arrow save the day.

A heartbroken Cupid returns to Star City with one goal – to destroy anyone in love. The team learns she’s killing couples on their wedding day so Oliver and Felicity decide to pose as bait.

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 Dahrk.

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.

Team Green Arrow’s ongoing battle with Damien Darhk is complicated by a shocking revelation. Thea’s bloodlust returns and she 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. Meanwhile, Sara joins Laurel, Thea, and the team on a rescue mission for Ray. However, the effects of the Lazarus Pit take over and threaten to jeopardize the entire operation. Donna Smoak returns to Star City.

When things take a turn for the worse with Sara, Oliver calls in a favor from an old friend who deals in the mystical, John Constantine.

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.

Oliver and Felicity’s blissful getaway is cut short when Thea and Laurel pay them a visit and tell Oliver they need his help back in Star City. The city has been attacked by Ghosts, assassins led by a dangerous man named Damien Darhk. However, when Oliver returns, Diggle makes it very clear that he doesn’t want Oliver on the team.

With time running out for Starling City, Oliver tries to stop Ra’s from unleashing the bioweapon and killing millions.

Ra’s tells Nyssa that she must marry Oliver or face death. Meanwhile, an unexpected ally travels to Starling City to ask Diggle, Felicity, and Laurel to help infiltrate Nanda Parbat. In the past, Maseo and Oliver try to find the cure for Akio before it’s too late.

Ra’s sets out to transform Oliver into his perfect heir. Meanwhile, Nyssa and Laurel draw closer, but their mentor/student relationship is threatened when Ra’s sends men to bring his errant daughter back to Nanda Parbat..

Oliver has no choice but to accept Ra’s’s offer to resurrect Thea. In return, Oliver must become the Heir to the Demon.

After Roy confesses that he’s the Arrow, Oliver is forced to lie low as Quentin continues his quest to prove that Oliver is the real Arrow. Meanwhile, a metahuman kills two bank guards and Oliver is forced to turn to Ray–as the Atom–for help.

Ra’s makes his next move against Oliver by reveling the Arrow’s secret identity to Quentin. Left without alternatives, Oliver has no choice but to surrender. Meanwhile, Ray is injured in an attack and Felicity must take a risk to save his life.

While the Arrow tries to track down the imposter killing criminals, Amanda calls Lyla in for a Suicide Squad mission and Diggle insists on accompanying his new wife. However, the Squad soon discovers that their rescue mission isn’t what they expected. Meanwhile, Ray learns that Oliver is the Arrow and sets out to bring him in for his crimes.

After hearing Ra’s al Ghul’s offer, Oliver returns to Starling City and contemplates whether he should accept it or not. Meanwhile, Quentin turns against the Arrow, and a new villain–Murmur–comes to the city to get revenge.

Thea betrays Malcolm to the League, but Oliver sets out to rescue his lover’s killer so that Thea won’t suffer the guilt of arranging for a parent’s death. In the past, Oliver and the Yamashiros are released from custody, but Amanda Waller has other plans.

Malcolm puts Oliver and Thea in a dangerous situation that lands them on Lian Yu with Oliver’s former enemy Deathstroke. In a flashback, Oliver and Maseo return to Starling City to retrieve the Omega bio weapon.

Vertigo causes Laurel to hallucinate an epic fight that pits her Black Canary against her sister Sara. Meanwhile, Chase surprises Thea and Roy warns Thea to stay away from Malcolm.

Brick and his men take over the Glades, and the police are helpless to stop them. With Oliver nowhere to be found, the team seems helpless. Meanwhile, Oliver tries to convince Tatsu to return with him to Starling City, and Malcolm’s past before his training at Nanda Parbat is seen.

Brick takes three city aldermen hostage and demands that Mayor Castle turn the Glades over to him in return for their safe return. Meanwhile, Felicity turns to Ray for help when she needs a helicopter, and Laurel realizes that she may be in over her head with her new crime fighting carer.

With Oliver gone, Diggle, Arsenal, and Felicity have their hands full dealing with a new crime lord: Brick. Meanwhile, Ray prepares his battle armor, and in Tibet, a mysterious figure finds Oliver’s body.

Ra’s al Ghul sends Nyssa and her lieutenant to Starling City to inform Oliver that the League will kill 50 people a day until Sara’s murderer is turned over to them. With time running out, Oliver finally identifies the killer… and realizes that he can never turn them over for execution. Meanwhile, Ray shows Felicity his new project.

A crossover event that began on “The Flash” concludes with Oliver teaming with the Flash to stop a boomerang-wielding killer who plants five bombs in the city that are set to explode at the same time.

The Arrow is stalked by an ex-police officer who he rescued during the Mirakuru siege and has become dangerously obsessed with the hero. Meanwhile, Ray asks Felicity to accompany him to a business dinner, and Thea is forced to hire a new DJ for Verdant.

A killer is murdering his victims and attempting to frame Ted Grant. The Arrow finally comes to his aid after Laurel protests her trainer’s innocence. Meanwhile, Roy goes to Felicity for help determining if he killed someone under the influence of Mirakuru.

Felicity’s past as a crusading hacker is revealed when someone uses a super virus that she designed to bring Starling City to a standstill. Meanwhile, Oliver and Thea work on their new relationship, and Felicity’s mother pays a visit.

Nyssa believes that Malcolm killed Sara and goes after him to avenger her lover’s murder. Oliver discovers that he has no choice but to stop her, despite Laurel insisting that he avenger her sister’s death. Meanwhile, Thea returns to Starling City and settles in… until Nyssa discovers that she’s Malcolm’s daughter.

Oliver tries to track down Thea in Corto Maltese as Diggle searches for a missing field operative. Meanwhile, Felicity adapts to her new job.

A mysterious archer known as Komodo appears in town and begins skewering businessmen. Meanwhile, Oliver worries about Thea, which forces Roy to tell him the truth about why she left town; and Ray Palmer pursues Felicity. In a flashback, Oliver is assigned his first kill and the target is his best friend, Tommy.