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 ... (more)for battle. J’onn and Alex recruit Lena to help them find a way to save the people of Earth-38. Part 1 - Supergirl - S05E09 "Crisis on Infinite Earths: Part 1" Part 2 - Batwoman - S01E09 "Crisis on Infinite Earths: Part 2" Part 3 - The Flash - S06E09 "Crisis on Infinite Earths: Part 3" Part 4 - Arrow - S08E08 "Crisis on Infinite Earths: Part 4" Part 5 - DC's Legends of Tomorrow - S05E01 "Crisis on Infinite Earths: Part 5"