After a violent shipwreck, billionaire playboy Oliver Queen was missing and presumed dead for five years before being discovered alive on a remote island in the Pacific. He returned home to Starling City, welcomed by his devoted mother Moira, beloved sister Thea and former flame Laurel Lance. With the aid of his trusted chauffeur/bodyguard John Diggle, the computer-hacking skills of Felicity Smoak and the occasional, reluctant assistance of former police detective, now beat cop, Quentin Lance, Oliver has been waging a one-man war on crime.
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After the Ninth Circle delivers a major setback for Team Arrow, Diggle reluctantly reaches out to a Four-Star General of the Defense Intelligence Agency for help, despite unresolved tension from their past. Meanwhile, Oliver discovers a piece of information that he believes will turn Emiko against the Ninth Circle. Alena returns with an interesting proposal for Felicity.
With the world counting down to nuclear armageddon, Felicity and Curtis must find a way to stop the missiles. Meanwhile, Oliver tries to convince the citizens of Star City that they are stronger together than apart.
Lost in the Flood 04x22
While Green Arrow and Spartan try to rescue Thea from Tevat Noah, Felicity, Noah, and Curtis try to shut down Rubicon for good. However, Damien has a hacker of his own... and Anarky has his own plans to destroy everything.
Monument Point 04x21
The team is forced to find Noah Kuttler--Felicity's father--to disarm the nuclear missiles that Damien has taken control of. However, Damien has sent two of his men to kill Noah and prevent his interference. Meanwhile, Anarky finds Damien's shelter and tries to destroy it.
Oliver calls in a favor with Constantine and goes to meet with an immortal shaman who can teach him how to fight Damien's dark magic. Meanwhile, Thea takes a break with Alex, while Diggle visits Lyla and Sara.
Canary Cry 04x19
Star City reels under the news that ADA Laurel Lance is dead. However, a new Black Canary emerges... and will kill anyone who she holds responsible for Damian's crimes.
Team Arrow are forced to trust Andy to help them track down the idol after Malcolm steals it for Damien. However, Oliver and Diggle disagree on whether they can trust Andy, threatening to tear the team apart.
Beacon of Hope 04x17
After hacking her way out of prison, Brie Larvan makes her way to Palmer Tech to steal Felicity's spinal implant. The villain uses her robot bees to cut off all access to the outside world, trapping Felicity, Thea, and Donna inside. Meanwhile, Malcolm delivers a message to Damien in prison.
Broken Hearts 04x16
Cupid returns to Star City and vows to prove to everyone that love is death. Meanwhile, Oliver and Felicity deal with the aftermath of their break-up. In the past, Oliver discovers that Reiter plans to use the lives of the slaves to power a mystical idol hidden deep beneath the island.
Damien demands that Oliver resign as a mayoral candidate, or he will kill William. In response, Oliver brings in a superhuman ally, Vixen, to help him track down his son.
Code of Silence 04x14
While Oliver preps for a debate, Quentin tries to shield his new girlfriend Donna from the truth that he was working with HIVE. Both men find themselves with larger problems with Damien unleashes a demolition expert on Star City to guarantee his wife's rise to power.
Sins of the Father 04x13
Oliver refuses to kill Malcolm in return for Thea's cure, and Malcolm refuses to surrender rulership of the League to save his daughter. Civil war tears through Star City as the two factions fight it out. Meanwhile, Felicity discovers that the Calculator is her father and tests him to see if he can be trusted.
Roy returns to Star City... working for a new villain, the Calculator, a genius computer hacker who plans to bring the city to its knees. Meanwhile, Thea's condition worsens, and in the past, Oliver takes the first step to leaving his darkness behind.
Shadowspire, a rogue military organization with ties to Diggle's time in Afghanistan, launch an attack on the A.R.G.U.S. agents that exposed them years before. Diggle has no choice but to rely on Andy for help. Meanwhile, Felicity confronts a specter from her past while dealing with her new role in Team Arrow.
Blood Debts 04x10
After Damien's attack on someone close to him, Oliver goes on a bloody manhunt trying to find the HIVE leader. However, Anarky returns to Star City with his own plan for revenge. Meanwhile, Thea confronts her blood lust while Diggle tries to reach his brother.
Dark Waters 04x09
Oliver goes public with Damien and HIVE, but is unprepared for the consequences. Meanwhile, Malcolm arrives in Star City to help his daughter, and Felicity discovers that Oliver was going to propose to her.
Legends of Yesterday, Part 2 04x08
The two teams of superheroes take refuge at a farmhouse while Carter trains Kendra in her newfound powers. However, when things go horribly wrong, Flash timejumps and tries to prevent catastrophe from happening again.
While Green Arrow and his team set out to recover Andy from Damien's forces, Ray tells Felicity that he's not sure what he's going to do with his future. Meanwhile, Thea receives a visit from Malcolm and gives in to her bloodlust in front of a shocked Alex.
Lost Souls 04x06
Felicity convinces Oliver to launch a desperate rescue attempt to recover a miniaturized Ray from Damien's captivity. Meanwhile, Sara finds herself giving in to the bloodlust of the Lazarus Pit, and Oliver thinks it's a good idea if Felicity takes some time off with her mother Donna.
Sara goes on a killing spree, and Oliver realizes that when she was brought back, her soul didn't come back with her. As Sara stalks the person who killed her, Oliver turns to an old friend from Lian Yu for help: the sorcerer John Constantine.
Beyond Redemption 04x04
Team Arrow discover that a gang of crooked cops is robbing drug dealers and selling their product. Oliver turns to Quentin for help, but soon learns that he is working with Damian. Meanwhile, Laurel brings Sara to Star City and reunites her with Quentin, but his reaction isn't what she had hoped.
Damian brings in a metahuman, Double Down, to take care of Green Arrow. Meanwhile, Diggle and Green Arrow continue working separately because of their past. And Laurel and Thea travel to Nanda Parbat: Thea to find a cure for her bloodlust, and Laurel to resurrect her sister.
The Candidate 04x02
Moira's friend Jessica Danforth decides to run for mayor of Star City. While Team Arrow tries to protect her, Oliver realizes that the Lazarus Pit is taking its toll on Thea. In the past, Oliver meets Baron Blitzkrieg, who offers Oliver a job.
Green Arrow 04x01
When a new gang, the Ghosts, hit the newly renamed Star City, Diggle, Thea, and Laurel find themselves in over their heads. Laurel and Thea interrupt Oliver and Felicity's quiet suburban lifestyle to ask them to come back and help.