Season 6 Episodes
THE AFTERMATH — Oliver deals with the fallout of the explosion on the island.
Oliver tries to balance being the mayor, the Green Arrow and a father to William (guest star Jack Moore). Anatoly (guest star David Nykl) returns to Star City with a deadly agenda.
03: Next of Kin
A rogue black ops team led by Onyx breaks into Kord Industries and steals something lethal. Oliver struggles to connect with William (guest star Jack Moore) so he reaches out to a surprising source for help.
Just as Oliver starts to get things in order, Black Siren launches another attack on the citizens of Star City.
05: Deathstroke Returns
Slade returns and asks Oliver for helping in tracking down his son. When they learn Joe has been taken hostage by mercenaries, their mission to save him gets complicated by a terrible revelation that could shatter Slade's hopes of reunion forever. Meanwhile, Vigilante reappears in Star City.
06: Promises Kept
As Slade continues to uncover clues about his son's last few years, Oliver makes a big decision. Meanwhile, the Green Arrow leads the team into battle against '' The Dragon'', a villian who is stealing valuable tech in Star City.
Oliver celebrates Thanksgiving with his family but the happy moment is interrupted. Meanwhile, Black Siren returns to wreak havoc on the holiday.
08: Crisis on Earth-X, Part 2
Barry and Iris’s wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony. All of the superheroes band together with help from their super friends like Citizen Cold (guest star Wentworth Miller), The Ray (guest star Russell Tovey), Felicity Smoak, Iris West and Alex Danvers to take on their most formidable villains yet. Earth’s mightiest heroes—Green Arrow, Supergirl, The Flash and White Canary—lead their teams into battle to save the world.
09: Irreconcilable Differences
Quentin Lance is kidnaped by Black Siren and Cayden James, who are looking to trade Lance’s life for a weapon of mass destruction. Oliver and Team Green Arrow must figure out a way to save Lance while still keeping the city safe.
Oliver Discovers a Shocking Truth about Cayden James (guest star Michael Emerson, Person of Interest, Lost)—Despite losing half his team, Oliver remains confident that he, Felicity and Diggle can stop Cayden James and Black Siren. However, when he discovers one of Cayden’s secrets, he decides to team up with an unlikely ally. Meanwhile, Dinah spends time with Vince.
11: We Fall
Cayden James (guest star Michael Emerson) ups the ante by launching his plan to take control of every aspect of the city. Despite the scope of Cayden’s plan, Oliver is determined to foil it with just the Original Team Arrow—and without the aid of Rene, Dinah, or Curtis. But things get complicated when William (guest star Jack Moore) is endangered as a result of Cayden’s handiwork.
12: All for Nothing
Oliver continues his battle with Cayden James (guest star Michael Emerson). Dinah and Oliver have a major disagreement that endangers the life of one of their own.
13: The Devil’s Greatest Trick
Cayden James launches a full out attack—Cayden James (guest star Michael Emerson) discovers a secret about the Green Arrow that pushes him over the edge. Knowing everyone and everything he loves is in danger, Oliver must decide if he can do this alone or if he needs to turn to his old teammates for help. William starts to demand more of Oliver’s time.
14: Collision Course
OTA VS. NTA—Oliver, Diggle and Felicity disagree with Dinah, Curtis and Rene on how to handle Black Siren. The two teams face off and a fight ensues.
Oliver and Thea are shocked to hear that Roy Harper (guest star Colton Haynes) is back in Star City. However, when they discover the circumstances of Roy’s return, Oliver and Thea realize that Roy is in trouble and jump in to save him. Black Siren makes a shocking decision.
16: The Thanatos Guild
Nyssa Al Ghul returns to Star City to warn Thea that a group of renegade League of Assassins members are planning to attack her. This group, led by Athena, is intent on finding a mysterious box that Malcolm left behind and will stop at nothing to get it. Nyssa helps Oliver come to a life-changing realization.
17: Brothers in Arms
Oliver makes a daring move that could cost him everything as he and Diggle face their biggest challenge yet. Curtis is disappointed to find out his new boyfriend has a firm anti-vigilante stance.
Oliver is visited by a ghost from his past—In his darkest place yet, Oliver wonders if he has failed at everything being a father, a mayor and a hero. His frustration rising, Oliver lashes out at Felicity and William. A surprising visit from an old friend has Oliver questioning his next move.
19: The Dragon
Looking to expand his empire, Diaz (guest star Kirk Acevedo) and Laurel meet with The Quadrant, a coalition of mafia families who run national organized crime. Meanwhile, after Oliver’s recent decision, Felicity and Curtis double their efforts on building Helix Dynamics.
20: Shifting Allegiances
Oliver turns to an old friend to help battle Diaz. Meanwhile, Rene is out of the hospital but has a hard time re-adjusting to life as Wild Dog. Also, Lance discovers something shocking about Black Siren.
21: Docket No. 11-19-41-73
The pressure mounts for Oliver who begins to wonder if he will lose everything in his battle to save Star City. A familiar face returns.