Oliver deals with the fallout of the explosion on the island.

Anatoly returns to Star City with a sinister agenda as Oliver tries to balance being the mayor, the Green Arrow and William's father.

A rogue black ops team led by Onyx breaks into Kord Industries and steals something lethal. Oliver struggles to connect with William so he reaches out to a surprising source for help.

Black Siren launches another attack on Star City just when Oliver has gotten things in order.

Slade returns and asks Oliver for help tracking down his son; the rescue mission gets complicated by a terrible revelation that could shatter Slade's hopes of reunion; Vigilante reappears in Star City.

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 villain 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.

The gang comes together for Barry and Iris's wedding, but the ceremony is crashed by villains from Earth-X.

Black Siren and Cayden James kidnap Quentin to get their hands on a weapon of mass destruction.

Oliver discovers one of Cayden's secrets; he decides to team up with an unlikely ally to defeat him; Dinah spends time with Vince.

William gets caught in the cross hairs as Oliver attempts to stop Cayden James with just the original Team Arrow.

Oliver continues to battle Cayden James; when Dinah and Oliver have a major disagreement, one of their own is put in danger.

Cayden James launches a full out attack when he uncovers a secret about the Green Arrow that puts him over the edge.

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.

Roy Harper returns to Star City and Oliver and Thea take action to save him when they discover the reason why he's come back.

Nyssa al Ghul returns to Star City to let Thea know that a group of renegade League of Assassins members are planning to attack her.

Oliver and Diggle face their biggest challenge yet; Curtis is disappointed to find out his new boyfriend has a firm anti-vigilante stance.

In his darkest place yet, Oliver wonders if he has failed at everything; Oliver lashes out at Felicity and William; a surprising visit from an old friend has Oliver questioning his next move.

Looking to expand his empire, Diaz meets with a group The Quadrant, a coalition of mafia families; after Oliver's recent decision, Felicity and Curtis double their efforts to build Helix Dynamics.

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.

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.

Diaz targets Team Arrow and their loved ones. Oliver struggles with Felicity putting herself in danger when she gets the chance to stop Diaz for good.