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Oliver reaccustoms himself to life out of prison, while a killer posing as the new Green Arrow kills two men. Meanwhile, Diggle and Lyle discover a secret terrorist backer and turned to an unexpected ally.
Diaz enters Slabside and takes control of the place, releasing the inmates. Oliver must team up with an old enemy to stop him.
Barry, Oliver, and Kara travel to Gotham City to try to find Deagan, and meet the city's new protector while discovering that Bruce Wayne has vanished. Meanwhile, a Flash from another world arrives to warn the heroes of what they face and who is responsible.