Nyssa returns to Starling City and tells Oliver that her father, Ra’s al Ghul has given him 48 hours to find Sara’s killer or the League of Assassins will return.
Oliver, Arsenal and Diggle track down the location of a boomerang-wielding killer named Digger Harkness but are surprised when they come face to face with an A.R.G.U.S. team.
Oliver must stop an Arrow-obsessed serial killer, Carrie Cutter, who is convinced that The Arrow is her one true love and will stop at nothing to get his attention.
After a body is found strung up in the Wildcat gym, Ted Grant becomes the main suspect. Oliver and Laurel argue over Ted’s innocence.
When a cyber attack brings Starling City to its knees, Oliver and Felicity are pushed to their limits to contain the destruction.
A furious Nyssa al Ghul (recurring guest star Katrina Law) returns to Starling City and confronts Oliver about Sara's death. When Oliver learns Malcolm Merlyn is alive, he suspects Merlyn killed Sara. Oliver and Nyssa join forces and go after the Dark Archer, intent on bringing Sara's killer to justice. Laurel keeps her distance from Nyssa, however as she blames her sister's death on her involvement with the League of Assassins. Meanwhile, Oliver and Roy work on repairing their respective relationships with Thea, who has returned home. Nyssa discusses Oliver with her father, Ra's al Ghul (guest star Matt Nable).
Oliver decides it's time for Thea to return home to Starling City, so he packs for Corto Maltese, where Felicity has traced Thea's whereabouts. Lyla (guest star Audrey Marie Anderson) asks Diggle to go with Oliver because one of her field operatives, Mark Shaw (guest star David Cubitt), has gone dark in Corto Maltese and she'd like him to look into it. Feeling responsible for Thea's departure, Roy joins Oliver and Diggle on their journey. Shaw double-crosses Diggle, putting numerous A.R.G.U.S. agents, including Lyla, at risk. Meanwhile, Laurel meets Ted Grant (recurring guest star J.R. Ramirez), and Felicity adjusts to her new job.
Lance calls the Arrow when another archer appears in town and starts skewering businessmen. Diggle uses A.R.G.U.S. to find the archer's identity; he is a man named Simon Lacroix (guest star Matt Ward), who goes by the codename Komodo. However, the team hits a rough patch with the mission and gets help from a surprising source – Laurel. Meanwhile, Oliver begins to worry that he hasn't heard from Thea, which forces Roy to tell him the truth about why she left Starling City. Ray Palmer pursues Felicity. In the flashback, Maseo Yamashiro (recurring guest star Karl Yune) tells Oliver that Amanda Waller has ordered his first kill. As Oliver looks down the scope of the rifle, he sees the target is his best friend, Tommy (former series star Colin Donnell). Despite her promise to her sister, Laurel debates sharing a secret about Sara (recurring guest star Caity Lotz) with Lance.
In the season premiere episode, Oliver searches for an identity beyond The Arrow. With crime in Starling City at an all-time low thanks to the Arrow and his team, Oliver thinks he can finally balance being both the Arrow and Oliver Queen and asks Felicity out on a date. However, when a new villain (guest star Peter Stormare) emerges, who has claimed the name Vertigo from the recently deceased Count, Oliver is caught off-guard and someone close to him is hurt. Oliver and a newly suited up Roy take on Vertigo. Meanwhile, Diggle becomes a father; Lance is promoted to Captain; Laurel joins Arrow's inner circle; and Felicity gets a part-time job at a tech store to make ends meet. Also, Oliver fights to regain his company, Queen Consolidated, but comes up against a very worthy opponent – the charming Ray Palmer (recurring guest star Brandon Routh).
An extended look at the trailer for Arrow Season 3
In the Season Two Finale, Oliver must decide once and for all whether he's a killer or a hero when Slade moves forward with his plan to kill one more person in Oliver's life. While Oliver has fought all year to be more than the killer he once was, he's pushed to the edge when Slade kidnaps someone close to Oliver's heart and realizes sometimes it takes doing the unthinkable to stop the monster. Meanwhile, Diggle takes on Amanda Waller with a little help from some friends, and Thea turns to Roy in her time of need.
Malcolm Merlyn returns. Oliver rallies his team as Slade's soldiers attack the city. Felicity gets a call from S.T.A.R. Labs with game-changing news and Thea comes face-to-face with her father – Malcolm Merlyn (recurring guest star John Barrowman).
After Slade threatens to take away everything Oliver loves, Oliver decides the fastest way to stop further bloodshed is to surrender to his enemy. Knowing that surrender will surely lead to Oliver's death, Diggle and Felicity go to extreme measures to keep Oliver from confronting Slade. Meanwhile, Thea considers leaving town, and Laurel resumes her crusade against Sebastian Blood. Finally, Slade unleashes his assault on Starling City.
The Mirakuru sends Roy into an uncontrollable rage and he unleashes his fury on the city. After Roy's deadly fight with a police officer, Oliver realizes the Mirakuru has taken over Roy completely and must figure out a way to stop him. Things get more complicated after Sara declares that Roy is too far gone and the only way to stop him is to kill him. Meanwhile, Thea believes she can breakthrough to Roy so she goes on camera at Moira's campaign rally to lure him to Verdant. Her ploy works but after Roy attacks Thea, Team Arrow unleashes on him.
Deathstroke hits Oliver at home. Oliver, Canary, Diggle and Felicity return to the lair and find Slade waiting for them. An epic battle breaks out and one member of Team Arrow is sent to the hospital. Thea hits her breaking point, but just as Oliver is about to reach her, Slade intervenes and Oliver is faced with a choice – his battle with Slade or his family. Meanwhile, Laurel struggles with a new secret.
Oliver's world starts to crumble when Slade makes his move against Oliver – and the repercussions are enormous. While Oliver scrambles to protect his family, a key player in his team starts to question Oliver's decisions. Meanwhile, Isabel makes her move to take Queen Consolidated away from Oliver.
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