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Oliver frees Slade and Digger from the supermax to help him defeat Adrian, but things soon go wrong. Meanwhile, Adrian claims that William is dead to get Oliver to reveal that he's the killer that Adrian has always claimed.

To force Oliver to get him out of prison, Adrian has his allies capture Curtis, Quentin, Thea, Felicity, and Diggle. Oliver has no choice but to gather new allies to stop Adrian and his team.

Oliver receives a bizarre delivery to his office, which ultimately leads to a secret about Robert that Oliver and Thea soon wish that they'd never learned. Meanwhile, Rene faces a custody hearing for his daughter Zoe.

Oliver and Felicity are trapped in the bunker after Adrian seals the doors and sets off an EMP bomb. While they try to get to the surface after Oliver is badly injured, their teammates try to find a way to help them.

Oliver, Team Arrow, ARGUS and the SCPD begin a citywide manhunt for Adrian Chase. Helix reveals to Felicity they have a way to find Chase but they will need something from her in return.

Diggle and Felicity are stunned when Oliver decides to seek help from the Bratva to help take down Prometheus. Concerned the Bratva may overstep his bounds, Diggle gets real with Oliver about what happens if things go awry.

Oliver gets closer to the truth about Prometheus. Meanwhile, Helix refuses to assist Felicity until she returns a favor.

Oliver encounters his biggest challenge yet as mayor. Felicity becomes entangled down her dark path with Helix. Vigilante attacks Oliver while he’s acting as the mayor, leaving it up to Diggle and the team to stop Vigilante once and for all.

China White, Cupid and Liza Warner escape Iron Heights and seek vengeance against Star City. Oliver tries to bring in the newly formed girl gang but the ACU intervenes mid-fight.

A traumatic attack on City Hall triggers disturbing memories for Rene. Flashbacks reveal details of Rene's past. Meanwhile, Oliver must deal with the perpetrator responsible for the attack and realizes the best way to do so is as Mayor Queen.

A mission takes Oliver, Felicity and team to Russia where they meet up with Oliver's old friend, Anatoly. Meanwhile, fresh out of rehab, Lance returns to the mayor's office ready to get back to work. However, when Susan asks for an interview with Lance to discuss his addiction, he balks and it's up to Rene to help keep things on track.

In his quest to take down Kovar, Oliver seeks help from an unlikely source, but it doesn't come without consequences. Felicity attempts to hack the NSA to help free Diggle but when her online efforts are flagged, she must combat an unknown adversary.

Worried that Prometheus is right that he is truly a killer at heart, Oliver looks for a ray of hope and actually finds it. Meanwhile, Felicity is determined to stop Prometheus, no matter the cost.

After Prometheus attacks Curtis, Oliver realizes Prometheus is aware of all of team Arrow's secret identities and has plans to come for them one by one. Felicity and Detective Malone discover a clue that connects Prometheus to Oliver's past.

When a new vigilante enters Star City, the team is divided over whether they should interfere. Diggle is frustrated with his new situation and Thea fights for Lance who confesses a shocking secret.

When Prometheus intensifies his killing spree, Oliver is determined to find a link between the victims. Felicity and Curtis discover the victims have a connection to Oliver's past and this new secret could turn things upside down.

When Tobias Church captures and tortures one of Oliver's new recruits, Oliver seeks help from an old friend, Christopher Chance AKA the Human Target. Meanwhile, Felicity's worlds collide when Detective Malone joins the ACU.

Oliver and Lyla pair up for a secret mission for Diggle. When Felicity finds out about it, she is upset and decides to stay behind. When Tobias Church launches a deadly assault against the city, Felicity must decide if she wants to send the recruits out sans the Green Arrow.

Although Oliver's new team is ready to hit the streets, he doesn't feel like they're prepared. Strong-willed Wild Dog ignores the Green Arrow’s orders and sets out on his own after a new drug dealer, Derek Sampson, who is terrorizing Star City.

Oliver recruits Curtis, Wild Dog and Evelyn Sharp for Team Arrow. Unfortunately, the Green Arrow’s training regimen is overwhelming. Meanwhile, in the flashbacks, Oliver’s initiation into the Bratva continues.

In the fifth season premiere, Oliver must combat a deadly new criminal who is threatening Star City.