The episode starts with a parallel to the first scene of the series. But, now Oliver is eight years older when fishermen come to rescue him on Lian Yu.
Oliver reunites with his mother, Moira, in a hospital.
Malcolm and Tommy greet Oliver when he comes home. Oliver learns that Thea overdosed on Vertigo on her 18th birthday and that Moira and Malcolm are now married.
Oliver, as the Green Arrow, breaks into a lab where a bunch of techs have been killed by arrows. There, he fights someone else dressed as the Green Arrow.
Black Siren shows up, revealing they are on Earth-2 in Starling City. Adrian Chase is Earth-2’s Green Arrow.
They figure out the Dark Archer is the one who killed the lab techs. Oliver believes it is Malcolm.
The Monitor surprises Oliver just as he’s about to confront Malcolm. He is the one who sent him to Earth-2 and to the lab to retrieve dwarf star particles but, they were already stolen by the Dark Archer.
In Star City 2040, Mia, William, Connor, and Zoe are at a fancy event trying to make sure nothing happens to Mr. Vasquez, a wealthy Glades citizen.
Oliver, as the Green Arrow, confronts Malcolm in his office. The Dark Archer shows up and him and Oliver fight. Tommy is the Dark Archer and gets away.
Dinah, a sergeant, questions the whole family about the attack in Malcolm’s office. Rene is Malcolm’s security guard.
Diggle, from Earth-1, is assigned to protect Oliver. Felicity is the one who figured out where Oliver was.
In 2040, John Diggle Jr. and the Deathstroke Gang attack the event and kidnap Vasquez.
At a party celebrating Oliver’s return, Diggle tries to stop Oliver’s mission but he restrains him before he can.
Tommy, with the help of Rene and Dinah, kidnap Oliver. Oliver figures out Tommy is trying to destroy the Glades and get vengeance for Thea; the Undertaking.
Oliver breaks from his chains and Diggle comes to help him escape. They go to Adrian and Laurel for help.
They try to stop Tommy and his followers from destroying the Glades with an earthquake machine.
Oliver and Tommy fight. Oliver convinces Tommy to shut off the machine.
Adrian gives Oliver the dwarf star particles that Tommy used to power his machine.
William, Mia, Zoe, and Connor rescue Vasquez. But, not before he gives the Deathstroke Gang secret codes and JJ gets away.
Tommy, Dinah, and Rene are arrested.
Oliver says goodbye to Moira.
Earth-2 is destroyed. Everyone dies except Oliver, Diggle, and Laurel who escape to another Earth.