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Alex is torn between destroying Lena before she can unleash Myriad, or using Malefic to stop the Luthor's mind-control plan. Meanwhile, Khan prepares to wipe humanity from the planet.
Leviathan's leader comes after Lena to get the medallion, and Lena convinces Supergirl to take her to the Fortress to find a weapon capable of stopping him. Kelly makes a confession to Alex, and John reaches out to his brother.
Harbinger gathers the greatest heroes of several worlds to battle the Anti-Monitor, his shadow demons, and the anti-matter wave that is sweeping across the multi-verse. While Lois, Brainiac-5, and White Canary search for Kal and Lois' missing son Jonathan, Alex asks for Lena's help evacuating Earth-38's population before it's too late.