Oliver struggles to deal with a city overrun by criminals and new vigilantes; when deadly new foe, Tobias Church, enters the scene, Oliver considers creating a new team of superheroes; in flashbacks, Oliver faces off against the Bratva.
The Green Arrow's training methods prove to be too much for some of the new recruits to handle; flashbacks reveal Oliver's initiation into the Bratva.
Wild Dog defies the Green Arrow's orders by taking it upon himself to go after drug dealer Garret Runnels, who is terrorizing Star City.
Oliver joins Lyla on a secret mission for Diggle while Felicity opts to stay behind; Tobias Church launches a deadly assault against the city.
Oliver must turn to an old friend when Tobias Church captures one of his new recruits; Felicity's worlds collide when Detective Malone joins the anti-crime unit.
Oliver searches for connections between Prometheus' victims; Felicity and Curtis discover the victims are all tied to Oliver's past; Thea has a talk with Lance; Felicity thinks about telling Malone the truth about her work.
Oliver learns about a new vigilante in Star City after the bodies of two criminals show up at SCPD; Diggle feels annoyed about his new situation; Lance confesses a shocking secret to Thea; in flashbacks, Oliver speaks with Konstantin Kovar.
Oliver wakes up to a life in which his parents are still alive and he is about to marry Laurel; Felicity faces a new threat with the help of The Flash and Supergirl.
After the attack on Curtis, Oliver realizes Prometheus is planning to make a deadly move on all of Team Arrow; Felicity and Malone find a clue that ties Prometheus to Oliver's past.
Oliver worries that Prometheus is right and really is a killer at heart; Felicity is bent on revenge after Detective Malone's murder; Diggle fights for his life in prison.
Oliver gets help from a surprising source in his quest to take down Kovar; Felicity tries to hack the NSA to help free Diggle; Curtis informs the team about a female vigilante wreaking havoc all over the country.
A mission takes Oliver, Felicity and the team to Russia, where they meet up with Anatoly, Oliver's old friend; fresh out of rehab, Lance returns to the mayor's office ready to get back to work.
An attack on City Hall brings back painful memories for Rene; flashbacks reveal Rene's transformation from family man to a hero named Wild Dog; Oliver realizes the best way to find the attacker is to do so as Mayor Queen.
China White, Cupid and Liza Warner escape Iron Heights and set out for Star City; the ACU seeks to arrest the Green Arrow for Detective Malone's murder.
When Vigilante attacks Oliver while he's acting as the mayor, Diggle leads the team on a mission to stop Vigilante once and for all.
Oliver gets closer to the truth about Prometheus; Helix refuses to continue helping Felicity until she does a favor for them.
Prometheus attempts to break Oliver; Anatoly worries about Oliver's increasingly violent tendencies, which come to a head in a brutal confrontation.
Oliver's decision to call the Bratva for help taking down Prometheus surpises Diggle and Felicity; Felicity makes a shocking discovery at Helix.
Oliver, Team Arrow, ARGUS and the SCPD kick off a citywide manhunt for Adrian Chase; Felicity needs to deliver something illegal that will entice Helix to go after Chase.
The situation gets intense when Oliver and Felicity are trapped in the bunker together; Lyla and Diggle deal with their martial issues.
Oliver faces the forced release of dozens of violent criminals prosecuted by Adrian Chase; a crate arrives at Oliver's office containing a mysterious corpse encased in concrete.
Black Siren returns to help Chase; Felicity organizes a birthday party for Oliver; Lance is furious when Rene misses the custody hearing for his daughter.