While Felicity decides whether she will help an injured Ray with an experimental treatment that could kill him, Oliver and his team go on the run when Quentin issues a warrant for the hero's arrest. Complicating matters, Ra's abducts Quentin as the next stage in his plan to discredit Oliver.moreless
Laura helps investigate a sailor's murder, and she uses the case to avoid celebrating her birthday. Meanwhile, Billy must team up with a hard-nosed naval investigator.
After their second wedding, Lyla and Diggle are called away by Amanda to run a Suicide Squad mission to rescue a captive U.S. senator in Kasnia. Oliver tries to track down the Arrow imposter only to discover that there are more than one, and Ray learns that Oliver is Arrow.moreless
An intern at a tech start-up is killed, so the detectives investigate. Meanwhile, Laura has trouble scheduling alone time with the new man in her life.
Oliver returns from Nanda Parbat with Malcolm and Diggle after hearing Ra's out, and questions his mission. Meanwhile, a new villain, Murmur, steals a shipment of industrial diamonds. And Quentin turns against Arrow after learning the vigilante knew the truth about Sara's death.moreless
After discovering how he used her, Thea betrays Malcolm to the League. Oliver tries to stop them to spare Thea the guilt of killing her parent, and travels to Nanda Parbat with Diggle. Meanwhile, Felicity tries to get Ray to focus when she learns that he's on the ragged edge.moreless
Laura and her team look for the killer of a beautiful Au Pair which sends them into the middle of a female escort ring. The precinct is in a frenzy when headquarters sends Detective Frankie Pulaski to investigate alleged indiscretions between Jake and Laura.moreless
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
Laurel faces her greatest fear when Vertigo drugs her with the vertigo drug. Meanwhile, Oliver deals with the team's changes in his absence, and Chase makes his move against Thea.
Laura and the team investigate when a female impersonator is murdered. Laura and an old friend have a wild night out on the town.
The detectives go undercover at a gala for one of New York's most elite prep schools to investigate the death of a star athlete.
Brick abducts three city alderman and demands that the mayor remove the police from the Glades. With Oliver gone, Arsenal and Diggle are all that stands between the crime lord and control of the district. However, Laurel insists on helping them, carrying on her sister's legacy as Black Canary. In the past, Maseo reveals to Oliver that he will do anything to save his family.moreless
Oliver has disappeared for three days, but Felicity refuses to accept that he's dead. Meanwhile, Diggle and Arsenal go after a new crime lord: Brick. Meanwhile, Malcolm travels to Tibet, Ray continues testing his battle armor over Felicity's objections, and Laurel steps outside the law to fight crime.moreless
Laura and her team investigate arson and the death of a teenage boy. Jake and a former firefighting flame create sparks. Laura tries to put work aside and concentrate on the twins' Winter Carnival.moreless
A crime in the culinary world is investigated by the detectives, and one suspect complicates things for Laura after she develops an intense crush on him.
A fertility doctor vanishes and his wife suspects foul play, so the detectives investigate and find themselves heading to the racetrack. Meanwhile, Laura earns the ire of a group of moms when the twins are accused of bullying others in their marital-arts class.moreless
Ra's al Ghul gives Oliver 48 hours to find Sara's murderer... or watch as the League kills 50 citizens a day. Meanwhile, Ray tries to apologize to Felicity for kissing her, and Oliver discovers who Sara's killer is.moreless
Barry travels to Starling City with Caitlin and Cisco, and ends up helping defend Lyla against an assassin determined to get his revenge on her despite Arrow and his friend's best efforts. In the past, Oliver is ordered to acquire information from a prison using whatever means necessary.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.
Arrow gets a stalker when a woman he once rescued decides to start killing criminals in the hopes that the two of them can be together. Meanwhile, Thea gets a new DJ and Ray invites Felicity out to dinner. In the past, Oliver helps Tatsu when Maseo goes missing.moreless
A killer frames Ted for multiple murders, and Arrow tries to find out who is really responsible. Meanwhile, Felicity runs a blood test on Roy at his request. In the past, Tatsu reluctantly helps Oliver track down a missing envelope.moreless
Felicity's mother Donna arrives in Starling City just as a terrorist group calling itself Brother Eye unleashes a wave of cyber-terror on the city. as Felicity struggles to find the villains, she realizes that they're using a computer virus that she created. Meanwhile, Oliver and Thea try to address their differences, and Laurel makes an error of judgment because of her guilt.moreless
A woman's body is found on a party bus, and the murder investigation leads to a beauty empire. Meanwhile, the detectives get competitive during an annual mud race.
Nyssa believes that Malcolm is Sara's killer, but Oliver isn't convinced. As they seek the truth, Laurel seeks revenge for her sister's murder and Roy tries to repair his relationship with Thea.
A gambling ring is uncovered by the team while they investigate the murder of a gallery owner's son in Koreatown, and Laura reunites with her estranged dad as she prepares to go undercover as a high-stakes poker player.moreless
Oliver goes to Corto Maltese to bring Thea home, while Lyla asks Diggle to find a missing ARGUS operative. Meanwhile, Ray gives Felicity her first assignment.
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
Laura and the team investigate when a body is found in the bathroom of a house whose owner is away. Laura and Jake explore a new way to fix their shared custody problem.moreless