While helping the Monitor, Oliver finds himself in a twisted version of his own Earth where Tommy and Moira are alive, Moira is married to Malcolm... and Thea is dead. In 2040, the new vigilantes take on the Deathstrokes.
In the present, Oliver and Diggle scour Hong Kong for a scientist the Monitor wants, and are joined by Tatsu, Laurel, and Lyla. In 2040, Zoe leads Connor and Mia to a bar where they believe JJ is going.
Oliver joins his sister Thea to find answers about Mar Novu's true goals. Diggle and Lyla go on a rescue mission, and in 2040, Mia and her team go up against the Deathstrokes.
Present and future become one as Mia, William, and Connor meet the original Team Arrow. The two teams join forces to stop the newest Deathstroke from terrorizing Star City.
Oliver, Laurel, Mia, and William travel to Russia to get the plans for a weapon capable of stopping the monitor, and Oliver faces reminders of his past with the Bratva. Meanwhile, Diggle recruits an ally to help him steal the plutonium for the weapon.
Oliver and Laurel find themselves in a time loop from the past where Quentin is still alive... and each time the loop resets with his death. The two heroes try to find a way to break the loop and determine what's going on.
Oliver, his team, and his children, travel to Lian Yu for one last mission. They face ghosts from Oliver's past, including an old friend, and Diggle questions Lyla's decisions.
Stuck in the Vanishing Point, the Paragons search for a way to escape. The futility of the situation is compounded by The Flash's disappearance. However, hope appears in the form of Oliver, who reveals that he has become something else. Meanwhile, the origin stories for The Monitor and Anti-Monitor are revealed.
It's the year 2040 in Star City and Mia Queen has everything she could have ever wanted. However, when Laurel and Dinah suddenly show up in her life again, things take a shocking turn and her perfect world is upended. Laurel and Dinah are tracking a kidnapping victim with direct ties to Mia and they need her help. Knowing it will change everything, Mia can't help but be a hero and she, Laurel and Dinah suit up once again to save the city.
After eight seasons, and the launch of countless superheroes, the series wraps up the story of the Green Arrow.