“Worlds lived, worlds died. Nothing will ever be the same.” The crossover starts on Supergirl S5E08, Batwoman S1E09, The Flash S6 E09 and Arrow S8E08.

Oliver assembles a group of unlikely allies – Slade, Nyssa, Merlyn and Digger Harkness – to engage in an epic battle against Chase and his army.

Oliver faces the forced release of criminals prosecuted by Adrian Chase, while a crate is delivered to Oliver’s office containing a corpse in concrete.

Oliver and Felicity get trapped in the bunker together, while Diggle and Lyla deal with marital issues.

Oliver, Team Arrow, ARGUS and the SCPD kick off a citywide manhunt for Adrian Chase. Helix tells Felicity they have a way to find Chase but they will need something…

Diggle and Felicity are shocked by Oliver’s decision to ask the Bratva for help in taking down Prometheus.

Oliver gets closer to the truth about Prometheus. Meanwhile, Helix refuses to continue helping Felicity until she does a favor for them.

When Vigilante attacks Oliver while he’s acting as mayor, Diggle leads the team on a mission to stop Vigilante for good.

China White, Cupid and Liza Warner break out of Iron Heights and head to Star City for revenge. Oliver tries to bring in the newly formed girl gang but the…

16 months ago, Rene watched his wife, an addict, being killed by a dealer in front of the former’s daughter, Zoe, who was transferred to foster care; and Rene was…

In flashbacks, Oliver and Talia kill an illegal drug merchant from Robert Queen’s list. Talia again presses Oliver to return home, but he chooses instead to help Anatoli kill Gregor….

During the S.T.A.R. Labs incident, CCPD undercover officer Tina Boland develops a sonic scream after watching her partner die at the hands of drug dealer Sean Sonus. In the present…

After things begin to calm down at the prison, Rick and his group now face imminent danger and destruction. This time, they might not win.

Something new unfolds at a camp outside the prison. The addition of new members may threaten peace.