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
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
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
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
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
A fashion designer's intern is murdered, so Laura infiltrates Fashion Week, where the suspects include top models and knockoff sellers. Elsewhere, Jake reassess Max's job.
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
Now that Arrow has crime in Starling City under control, Oliver tries to have a personal life. However, he and Roy are forced to forgo their personal plans when a new Count Vertigo begins dealing drugs, and a charming scientist makes a bid for Queen Consolidated. Meanwhile, Diggle has a new child, Quentin gets a promotion, and Laurel joins Arrow's crimefighting efforts.moreless
A political sex scandal erupts and Laura investigates the alleged mistress involved. However, problems with surveillance emerge, forcing detectives to enter the world of online gaming in order to zero in on a murderer.moreless
Laura and Jake are forced to team up at the site of their first date when an old friend and owner of a biker bar is killed. Laura has Max secretly check up on the twins.moreless
Online dating leads to a woman's murder, so Laura tries to bait the killer by using an Internet dating site and going to nightclubs undercover. She also considers getting back into the dating scene for real after Jake finally signs their divorce papers.moreless
In the series premiere of this comedy-drama, a talented New York City homicide detective struggles to balance her demanding job with her hectic home life, which includes rambunctious twin boys and a husband who's reluctant to sign divorce papers.moreless
Oliver must fight to maintain his vow not to take a life when Slade kidnaps someone close to him. Meanwhile, it's Thea who turns to Roy for help, and Diggle takes on ARGUS.moreless
As Slade unleashes his wave of Mirakuru-enhanced soldiers on Starling City, Oliver and his team prepare to take them on. Meanwhile, Malcolm returns to town to meet his biological daughter.
Oliver decides the best way to protect everyone in the crossfire is to surrender himself to Slade before his friends are hurt further. When they realize what Oliver plans to do, Diggle and Felicity band together to stop him. Meanwhile, Laurel renews her investigation into Blood's activities, and Thea considers leaving Starling City.moreless
When Roy kills a man under the effects of Mirakuru, Oliver and Sara disagree on how to stop hm. Meanwhile, Thea tries to lure Roy to Verdant in the hopes that his feelings for her will let him combat the serum.moreless
Arrow battles Slade, which results in one of his friends going to the hospital. Meanwhile, Thea hits her breaking point, forcing Oliver to choose between her or Slade.
Oliver attempts to protect his family after Slade launches the next stage of his plan for revenge for Shado's death and Oliver's betrayal. However, one of Oliver's team questions whether Oliver is seeing clearly. Meanwhile, Isabel schemes to take control of Queen Consolidated.moreless
The Huntress returns to town to kill her father, who has been arrested. Oliver promises Sara that he'll stop his ex-girlfriend. However, when Huntress takes a courthouse hostage, including Laurel, Sara steps in. Meanwhile, Roy realizes the cost he must pay to keep Thea safe.moreless
A.R.G.U.S. recruits Diggle to take down a former acquaintance who is now planning to take over Afghanistan. However, he discovers that his new team will consist of three criminals that he formerly put away: Deadshot, Bronze Tiger, and Shrapnel. Meanwhile, Oliver pushes away Sara as he prepares for his battle with Slade.moreless
Stephen is still walking a fine line with his ULTRA partner Hillary who continues to question his loyalties.
When ULTRA and The Tomorrow People both learn of a breakout using her powers to benefit humans both sides seek her out to join their cause.
Meanwhile Morgan takes a risk and betrays Jedikiah's trust to help The Tomorrow People but Jedikiah learns something from her that is an even bigger surprise.
Oliver discovers that Slade is alive and intends to get revenge for Oliver's actions against him on the island. Meanwhile, in flashback Oliver and Sara prepares to take the Amazo, but Sara tells Oliver that he must kill Ivo to keep the doctor from revealing to Slade who is responsible for Shado's death.moreless