After a fight with Cyrus Gold AKA the Acolyte, Oliver is drugged and left for dead. Determined to cure him, Felicity makes a risky decision.
A seemingly impossible robbery at Queen Consolidated’s Applied Sciences Division brings Central City police scientist Barry Allen to town.
Oliver discovers Vertigo in Diggle’s blood and realizes The Count has broken out of prison and is once again distributing his drug.
Amanda Waller sends A.R.G.U.S. agents to kidnap Diggle and informs him that Lyla has gone missing after following a lead on Deadshot in Moscow.
While Oliver tends to the Canary’s wounds, he tries to get her to talk about where she came from but she refuses until they are attacked by a trained killer from the League of Assassins.
Oliver Queen discovers a man who goes by the name “The Mayor” (guest star Cle Bennett) is bringing illegal guns in to The Glades, so Oliver sponsors a “Cash for Guns” event to help clean up the city.
Officer Lance's past puts Laurel in danger. Lance learns a criminal named Barton Mathis (guest star Michael Eklund), whom he put away years ago, broke out of prison during the quake and is back to torturing and murdering women. Felicity offers herself as bait so Arrow, Diggle and Lance can catch this villain, but the plan goes awry. Furious, Mathis kidnaps Laurel in retaliation and plans to murder her while Lance watches. Meanwhile, Thea and Oliver are stunned when District Attorney Adam Donner (guest star Dylan Bruce) seeks the death penalty for Moira. Oliver asks Roy to help him find the Canary (guest star Caity Lotz).
DC Comics' Bronze Tiger and China White wreak havoc on the Glades. Oliver finds out that medicine being sent to Glades Memorial Hospital is being hijacked by thieves – and without an influx of supplies, the hospital will close. When Roy attempts to stop the thieves, he fails and is arrested by Officer Lance. Oliver gets into a heated battle with China White (recurring guest star Kelly Hu) and her new partner, Ben Turner, aka the Bronze Tiger (guest star Michael Jai White), over the supplies. Meanwhile, Laurel makes plans to catch the Arrow, and Thea gives Roy an ultimatum.
In the season premiere, Oliver must transform from vigilante to hero. Diggle and Felicity travel to the island of Lian Yu in search of Oliver, who left Starling City after the devastation of The Undertaking and his failure to avert it. Convinced to return home, Oliver finds that things are in much worse shape than he imagined – Isabel Rochev (recurring guest star Summer Glau) is preparing a hostile takeover of Queen Consolidated, Thea refuses to visit Moira in jail, Roy is trying to fill the void left by the Arrow's absence, and Laurel is working with the District Attorney's office to take down the vigilante. Meanwhile, flashbacks to the island show Oliver's mentors Slade (new series star Manu Bennett), Shado (guest star Celina Jade) and Oliver in a desperate situation.
This one-hour special gives fans a chance to catch up on the incredible events that led billionaire Oliver Queen to secretly create the persona of Arrow and an exclusive look at season 2.
In the season finale, Oliver and Diggle try to stop the Dark Archer from unleashing his vengeance on the Glades. Meanwhile, Thea races to find Roy.
With the Undertaking just days away, Malcolm dons his black hood to conclude business with seismologist Brion Markov and his team.
As Oliver focuses on crossing another name off the list, Felicity finds a transaction on a shady accountant's laptop that may help him locate Walter.
When Deadshot returns to Starling City after taking down a U.S. ambassador and six others abroad, a sting operation is launched to capture him alive.
When a young woman meets a violent death after partying at Verdant, Det. Lance uncovers incriminating evidence against Tommy.
An angry resident of the Glades embarks on a kidnapping and killing spree to punish those he believes have wronged the residents of his neighborhood.