Patrick and Bear cover the rest of the season in this mega episode.

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.

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 then, in his darkest place yet, Oliver wonders if he has failed at everything.

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.

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.

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

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

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

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

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