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Supergirl Season 5 Episode 9

The Monitor sends Harbinger to gather the worlds’ greatest heroes – Supergirl, The Flash, Green Arrow, Batwoman, White Canary, The Atom and Superman – in preparation for the impending Crisis. With their worlds in imminent danger, the superheroes suit up for battle while J’onn and Alex recruit Lena to help them find a way to save the people of Earth-38.

This crossover continues on Batwoman S1E09, The Flash S6E09, Arrow S8E08, and Legends of Tomorrow S05E01.