At Slabside Maximum Security Prison, Oliver is determined to keep a low profile to shorten his sentence; Oliver is tested when he runs into old foes; Diggle and Dinah have taken on new jobs and left their costumes behind.
Oliver must align with an old enemy to track down Diaz; Felicity's attempts to root out Diaz are thwarted by Diggle, whose allegiance to ARGUS requires him to keep civilians like her on the outs; Felicity resolves to find a new way to go after Diaz.
Still in prison, Oliver faces his biggest challenge yet; Felicity gets an intriguing offer; Diggle asks Curtis to go under cover for ARGUS.
Oliver makes a drastic move in his quest to find Diaz; when arsonists target Rene's community center, the mysterious new Green Arrow swoops in to help save the day; Dinah must decide whether following the rules is the best plan to keep the city safe.
Felicity learns something shocking about Oliver; Diggle asks Curtis to go under cover for ARGUS; Dinah works with an unlikely ally.
Slabside becomes even more dangerous after a guard is murdered and everyone is a suspect; Felicity seeks help from an unexpected source as she pursues Diaz; Laurel flexes her muscles as the District Attorney.
Oliver makes a choice that will affect his entire life, as well as the lives of everyone he cares about.
Felicity stands by her recent decisions regarding her family; Diggle and Lyla continue to look into the Dante painting that Curtis found.
Oliver and Barry get a lead on John Deegan and head to Gotham City with Supergirl to figure out why their reality has changed; Kate Kane provides the friends with information that leads the group to Arkham Asylum.
Oliver wants to get back to work and focus on his marriage, but Dinah wants him to track the new Green Arrow; Diggle and Lyla must answer to ARGUS about Diaz.
The past comes back to haunt both Oliver and Laurel; Curtis is upset when he discovers that Diggle and Lyla have restarted The Ghost Initiative with Diaz, China White, Kane Wolfman and Carrie Cutter.
A documentary camera crew follows Oliver and team around to talk about their past as vigilantes and what the Green Arrow means to Star City.
Oliver and Felicity are disappointed after they learn that William is hiding something from them; Oliver steps back from his Green Arrow duties and lets the team take over tracking down a serial killer.
After months of covertly pursuing Dante, Diggle and Lyla finally get a lead on the elusive terrorist; Oliver tries to bond with Emiko.
Team Arrow attempts to work with the Star City Police Department, but much to Oliver's frustration, things don't go as planned; Dinah gets some life-changing news.
Mia and William go on a dangerous mission; Dinah, Roy and Zoe deliver some devastating news; flash forwards share highlights from Mia's childhood with Felicity.
Laurel learns about some damaging information that affects Emiko; Oliver invites Laurel to help investigate, which makes Felicity happy, as her friend is now working with the team; Felicity is forced to make a choice between the team and Laurel.
After having her criminal past exposed, Laurel goes full Black Siren and goes on a crime spree; while Dinah aims to bring Laurel in, Felicity refuses to give up on her friend, even summoning Sara Lance for help.
After a major setback, Diggle reluctantly reaches out for help; Oliver discovers a piece of information that he believes will turn Emiko against the Ninth Circle; Alena returns with an interesting proposal for Felicity.
When they learn of an upcoming attack on the city, Team Arrow calls Roy Harper to help them stop the Ninth Circle; things go awry and there is massive collateral damage; Dinah investigates what happened.
Oliver finds himself in a precarious position; SCPD shows up with a warrant for Felicity.