Five months after being exposed as Green Arrow and into his life sentence, Oliver Queen tries to maintain a low profile in Slabside Maximum Security Prison in hopes of getting a reduced sentence, an effort which is complicated when Danny "Brick" Brickwell tries to coerce Oliver into helping him and by him being stalked by Ricardo Diaz's associates. Meanwhile, Felicity Smoak and William Clayton try to cope with witness protection while John Diggle and A.R.G.U.S. continue hunting the fugitive Diaz
The Longbow Hunters arrive in Star City and the team works together with A.R.G.U.S. to try and stop them from stealing a weapon with incredible destructive capabilities. Felicity and Diggle clash over their priorities in dealing with Diaz, leading Felicity to strike a deal with Agent Watson. Meanwhile, Laurel Lance and Dinah are forced to put their feud aside and work together, while Oliver tries to get rid of a prison guard in exchange for info on Diaz from Brick. ---- In flashforwards, William
Oliver demands Brick honor their deal and Brick says an inmate known as "The Demon" is Diaz's direct connection to Slabside. Brick claims to have arranged a meet with the Demon, but Oliver is instead ambushed. After defeating Brick's hired men, Brick reveals the Demon is incarcerated on Level Two, prompting Oliver to attack a guard to get transferred there. Meanwhile, Felicity plans a trap for Diaz and the Longbow Hunters at the CDC along with Rene and Dinah. The plan fails and Agent Watson is t
In prison, Oliver is tortured both psychologically and by means of drugs and electrical devices, in order to "reprogram" his brain. In Star City, Dinah arrests Rene when she learns that he is providing support to the new Green Arrow but, when the vigilante saves Zoe Ramirez's life, she has a change of heart. Working together, Dinah, Rene, and the vigilante are able to capture a group of arsonists plaguing Star City. Elsewhere, Felicity enlists the help of Laurel to torture the Silencer for infor
After having seemingly been broken, Oliver is introduced to Level Two, a secret facility below Slabside, where inmates are kept in inhumane conditions and forcibly become experimental test subjects overseen by Dr. Jarrett Parker. He discovers that Talia al Ghul is the Demon. He reluctantly teams up with Talia to plan an escape, but decides not to escape himself to avoid having to spend the rest of his life as a fugitive. After collecting evidence of what happened in Level Two, he asks Talia to d
Diaz slaughters the Bratva and tortures Anatoly Knyazev in order to get in contact with one of his former KGB associates. Team Arrow rescues Anatoly and discovers that Diaz plans to level Star City with aerial explosives obtained from the associate. Team Arrow foils the plan and finally captures Diaz with help from the new Green Arrow. Meanwhile, in Slabside, Stanley Dover is accused of murdering a guard, but proclaims his innocence. Oliver finds the knife used in the attack, which belonged to B
Oliver is told that he is set to be released from prison. Oliver confronts Stanley about his framing Turner for the guard's murder and then visits Turner, promising to help him once he is out of prison. Diaz arrives at Slabside via prisoner transport, but bribes a guard to release him and then visits Oliver, threatening to kill him and his family. After guards refuse to take his warnings about Diaz seriously, Oliver breaks out of his cell and escapes Level One in order to contact Team Arrow. Dia
Now free from prison, Oliver tries to readjust to outside life. When a murder occurs at a party honoring Oliver, the new Green Arrow is suspected and Oliver, Dinah, and Rene set out to prove the vigilante's innocence. Meanwhile, Oliver and Felicity struggle to adjust to the changes Oliver's incarceration inflicted upon their lives and relationship. After she helps Oliver arrest Max Fuller for orchestrating Frank Cassady's murders of Sam Hutchinson and Clayton Ford, Dinah authorizes Oliver to wor
Oliver, Barry Allen, and Kara Danvers head to Gotham City to find John Deegan, but are quickly arrested. However, they are bailed out by Kate Kane, who tells them Deegan can be found at Arkham Asylum. With some assistance from Oliver and Barry's teams, they break in to confront Deegan and retrieve the book he used to rewrite reality, only for the doctor to escape by causing a mass breakout. While trying to contain it, Batwoman shows up to help them before telling them to leave Gotham. Returning
Oliver discovers blood belonging to the new Green Arrow and Felicity determines that it belongs to a woman named Emiko Queen, Oliver's father's illegitimate daughter and thus his paternal half-sister. Oliver goes through his father's belongings and discovers that his mother knew about Emiko and her mother Kazumi Adachi. After being injured, Emiko goes to Rene for help and reveals that she seeks to avenge her mother's murder in the Glades. Emiko visits her father's grave, where she is confronted
Felicity and Laurel work together to track down a person Laurel believes may have followed her from Earth-2. The person is eventually revealed as the Earth-1 version of the drunk, Brett Collins, who accidentally killed Laurel's father. The Earth-2 version of Brett is revealed to have died five years earlier. Diaz attempts a mass breakout from A.R.G.U.S., killing Curtis in the process, before it is revealed he was in a controlled virtual reality simulation conceived by Curtis to extract informati
Oliver allows a camera crew to follow himself and others associated with Team Arrow around and film a documentary titled The Hood and the Rise of Vigilantes. A new vigilante, named Chimera by Curtis, begins attacking vigilantes in Star City, including Ragman, Huntress, and the new Green Arrow. William returns from witness protection and tells Felicity he was expelled from school, while Oliver debates Mayor Pollard about vigilantism but is interrupted by Chimera. During the attack, Dinah saves Po
Members of Team Arrow receive threatening notes and discover a similar note at the murder scene of a councilman who previously worked with Ricardo Diaz. Tracking a drug used to immobilize the victim, they discover the hiding place of the "Star City Slayer," who is revealed as Stanley. He slits Dinah's throat, but Curtis cauterizes the wound, saving her life. Stanley confronts Oliver, Felicity, and William at their apartment, claiming to be the only one who truly understands Oliver. While Felicit
Felicity and Laurel continue growing closer, with Felicity revealing to her that she is pregnant with Oliver's child. John and Lyla successfully locate Dante with the Ghost Initiative, identifying A.R.G.U.S. Director Bell as the mole. During the operation to catch Dante, Diaz betrays the team to warn him and he escapes, killing Bell and potential client Quraci Princess Noor in the process. Diaz is taken back to Slabside, where an unseen assailant lights him on fire in his cell, killing him. The
Team Arrow works with the SCPD to take down an operation that is manufacturing poison bullets. When the initial attempt as part of the SCPD fails, Team Arrow goes rogue and successfully takes down the operation as vigilantes, resulting in Mayor Pollard creating a special vigilante task force that is sanctioned by the SCPD and made up of Team Arrow. Dinah, who can no longer fully perform the Canary Cry following her injury, decides to return to the field as part of the task force. Laurel visits S
In the flashforwards, Mia and William follow Felicity's coordinates to Galaxy One headquarters. They are almost caught, but are saved by Connor, who reveals himself as an agent of Knightwatch, a "good version of A.R.G.U.S." Meanwhile, Rene confronts Dinah, Roy, and Zoe, revealing that Galaxy One plans to blow up Star City to rebuild it like the Glades, but the city will be evacuated beforehand. The three discover that a terrorist organization named Eden Corps, that uses Galaxy One as a front, pa
Laurel tells Oliver about Emiko killing Diaz. Oliver finds Emiko and Dante stealing drones and confronts Emiko, who states that she owes Dante and the Ninth Circle for helping her when she was abandoned by her father. Using Archer, Team Arrow locates Dante and, when he seemingly believes Emiko has betrayed him, Oliver saves her and takes her back to the Arrow bunker. However, she escapes after being caught planting a jammer, which takes down Archer and allows the Ninth Circle to steal Sarin gas.
Laurel goes on the run and partners up with a former associate named Shadow Thief. Felicity discovers that Emiko framed Laurel, but Dinah informs her that Laurel has gone back to committing crime as Black Siren. After failing to convince Laurel to come back, Felicity recruits Sara Lance to come to her and Dinah's aid. The three confront Laurel about what she wants to be, which leads to her turning on Shadow Thief. Dinah clears Laurel's reputation by claiming she went undercover. Laurel decides t
With the Ninth Circle after a Department of Defense vault drive, Diggle contacts his stepfather, General Roy Stewart, but Stewart refuses to give up classified intel. After they steal Archer from Smoak Tech, Stewart reveals the drive contains an asset list the Ninth Circle can now track. While securing the assets, Diggle and Stewart are captured by Dante. Stewart surrenders codes for a biological weapon called Cygnus X-1 when Dante starts torturing Diggle. The two call in Team Arrow with the Spa
Dinah and Sergeant Bingsley interrogate Team Arrow, who are in SCPD custody accused of killing two subway station security guards. They reveal they recruited Roy Harper to help with an operation where they successfully prevented the Ninth Circle from releasing their biological weapon. After Oliver names Emiko as the killer, the team is released since their stories line up. It is revealed that they all lied and that Dinah was part of the operation, in which Roy killed the guards in a fit of rage.
Oliver is trapped one floor below his team. The physical and psychological trauma causes him to hallucinate Tommy Merlyn talking to him about how to deal with Emiko. Oliver refuses to listen to Tommy about using the best parts of himself to save her until he envisions a scenario where his vendetta against Emiko leads to the deaths of his teammates. Team Arrow locates Oliver and saves him. Meanwhile, the SCPD raids Smoak Tech, accusing Team Arrow of both the cover-up and the biological weapon, wh
Emiko spreads the virus throughout the city and holds the detonator in the former Queen Consolidated building. Team Arrow, with Curtis, Laurel, and Ben Turner, evacuates it and disables the relay to the other bombs, while Oliver confronts Emiko, pleading for her to abandon the dark path. Beatrice informs Emiko that her failure to destroy Star City, while publicly exposing the Ninth Circle, has led to the council turning on her. Oliver and Emiko fight the Ninth Circle together, but Emiko is morta
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