Malcolm engineers Slade's escape to train Oliver and Thea in how to survive. Meanwhile, five years ago Amanda brings Oliver and Maseo to Starling City to recover the Omega bio weapon, and Oliver must decide whether to stop China White or stay with his friends and family who are falling apart without him.moreless
Religious motives are suspected in a couple's murder. Meanwhile, Laura and Jake look for a new nanny and encounter a familiar face in their search.
Oliver and his team look for Sara's killer and the trail leads to an assassin, Komodo, who is methodically eliminating his targets. While they hunt down the killer, Roy tells Oliver why Thea isn't returning his phone calls. In the past, Maseo informs Oliver that he has to kill Tommy Merlyn.moreless
Root intersects with the team again when the Machine gives Finch the Number of a janitor after it sends Root to investigate the man.
After a battle with Cyrus Gold, Oliver is poisoned and left for dead, and Felicity gives him an antidote that causes hallucinations of his past. Meanwhile, Brother Blood captures Roy, Barry continues assisting Felicity, and Lance loses someone when he tries to run surveillance on Cyrus.moreless
When they discover Malcolm's plan, Oliver and Diggle try to stop him but lose Felicity to a police arrest. Meanwhile, Thea learns that Roy is in danger and goes to The Glades, endangering herself as well, while Oliver risks what's left of his friendship with Tommy for the sake of honesty. In the past, Oliver, Shado, and Slade try to stop Fyers from bringing down a passenger jet.moreless
The Dark Archer visits a seismologist to further The Undertaking. Meanwhile, Laurel makes a decision after Tommy tells her the truth, and Roy and Thea try to find The Hood. In flashback, Fyers tells the captive Oliver, Shado, and Slade of his plans for the missiles and for Yao Fei.moreless
Left with no one but Felicity to rely on, Oliver goes after an accountant and gets a lead on Walter's whereabouts. With Diggle out of his life, Oliver turns to Felicity for help in the field. Meanwhile, Tommy tells Laurel the truth about what he's doing, and Malcolm remembers working with Robert Queen and Frank Chen to alter The Glades forever after the death of his wife.moreless
Oliver and his team go after Deadshot, only to discover that ARGUS plans to capture the assassin... and recruit him as an operative. Meanwhile, Roy seeks out The Hood while Laurel inadvertently drives a further wedge between Oliver and Tommy. And on the island, Shado teaches Oliver how to use the bow.moreless
A woman at Oliver's club dies of Vertigo and Oliver confirms that The Count is apparently not responsible. However, when The Count escapes, Oliver sets out to bring him in and finds out who is really responsible for the drug distribution. Meanwhile, Quentin gets a lead that takes him to Tommy as the suspected distributor, and Tommy has to take extreme measures to prove his innocence. Meanwhile, on the island, Oliver continues his studies with Slade and Shado.moreless
A new vigilante, The Savior, stalks The Glades, killing those that he believes have wronged the residents and broadcasting their deaths online. When The Savior explains that he was inspired by The Hood, Oliver sets out to stop him. Meanwhile, Quentin comes to accept that Dinah is telling the truth and Sarah is still alive, but Laurel isn't so sure.moreless
Oliver's life is going smoothly for once... until the Huntress returns to town. Meanwhile, Thea gets Roy Harper at job at the new club just in time for its opening night, and Laurel and Quentin try to come to grips with Dinah's return.moreless
Deadshot is back and working with China White to kill Malcolm Merlyn. While Oliver goes after the two assassins, he struggles to help Tommy resolve his issues with his father and navigate a new relationship with old girlfriend McKenna.moreless
Infamous criminal Cyrus Vanch plans to take on The Hood to reestablish his reputation as Starling City's leading crime lord. Meanwhile, Oliver confronts his mother over the copy of the list that Walter found, and Quentin unintentionally endangers Laurel.moreless
Oliver hunts down a drug dealer known as "The Count" to prevent the distribution of a new drug known as Vertigo... after Thea has been arrested for using it. While Oliver turns to a former girlfriend and current vice cop for help, Moira defends Thea and Felicity learns more about Moira.moreless
Oliver and Diggle are at odds when Diggle's former commanding officer is next on the list. Meanwhile, Thea notices when Moira and Malcolm spend time together, while Tommy and Laurel have dinner with Tommy's father.moreless
Oliver, his confidence undermined by his defeat at the hands of the Dark Archer, goes up against a psychologically traumatized firefighter. The man has started committing acts of arson while calling himself Firefly. Meanwhile, Thea tries to cheer her mother up and Tommy throws a benefit for the firefighters.moreless
When he discovers that Moira and Thea stopped celebrating Christmas since his disappearance, Oliver tries to throw a Queen Christmas party. Meanwhile, Tommy and Laurel disagree on how they should spend Christmas together.moreless
Oliver takes Helena under his wing and trains her in the life of a street vigilante. However, Diggle has concerns about Helena, concerns that soon prove true when Helena kills the head of the Triad and puts herself and Oliver at risk.moreless
Oliver meets a kindred spirit: the daughter of a mobster who has her own desire for vengeance. Meanwhile, Tommy turns to Laurel for help.
When an off-duty officer is wounded by bank robbers calling themselves the Royal Flush Gang, Diggle tries to convince Oliver that he must do more than go after the men on his father's list. Meanwhile, Tommy asks Thea for dating advice and Moira demands to know why Oliver keeps disappearing.moreless
Oliver is arrested for murder and insists that Laurel defend him, putting her at odds with her father. However, when Oliver offers to take a polygraph test, Laurel asks him if there was anyone else on the island... and the vigilante remembers his first encounter with the mercenary Deathstroke.moreless
Oliver learns that he is not the only person in Star City that is flying under the radar of the police. An assassin named Deadshot is targeting businessmen bidding on an energy project, and Walter is one of the men involved. Oliver has no choice but to turn to Detective Lance for help to protect his family while he taken on the killer.moreless
A corrupt businessman, Martin Somers, hires a Chinese assassin named China White to eliminate Laurel for finding out too much. While protecting Laurel, Oliver is offered the chance to take back control of the company.moreless
While on vacation Oliver Queen's ship is destroyed in a storm and he is the only survivor. He finds himself trapped on an island for the next five years. Once he makes it back to Starling City he is reunited with his family and his former girlfriend, but they are unaware that he has changed... and has put the skills he learned to survive on the island to become the vigilante that the city needs.moreless
Kate takes a lie detector test to prove she didn't shoot anyone. Bridget is back in town to get Dean back, Maggie writes a harsh article on the Senator, and Ted thinks about proposing to Amanda.moreless
The girls' next stop is Berlin where Kate has her next assignment and Maggie is determined to meet President Kennedy.