New threats rise. Old threats return. A war is brewing, threatening to plunge the world into darkness. Team Flash, Team Arrow, the Legends, and Supergirl must unite to prevent the storm that comes their way. However, they must first each conquer their own obstacles in order to face the challenges ahead. (Based on Arrow S6, Flash S4, Supergirl S3, and Legends of Tomorrow S3)
Crossover - Flash & Arrow - Rated: T - English - Drama/Romance - Chapters: 45 - Words: 249,438 - Reviews: 281 - Favs: 102 - Follows: 90 - Updated: 3/26 - Published: 12/29/2017 - Barry A./The Flash, Dr. Caitlin S., Oliver Q./Arrow/Green Arrow, Black Siren/Earth-2 D. Laurel Lance