AU events of Arrowverse's "Invasion!" crossover! What if The Flash recruited Superman, Superboy, and Green Arrow from a reality known as Earth-21, instead of Supergirl from Earth-38, to help fight the Dominators? Set during The Flash Season 3, Arrow Season 5, Legends of Tomorrow Season 2, and over five years after the series finale of Smallville!
Rated: T - English - Adventure/Sci-Fi - Chapters: 6 - Words: 25,676 - Reviews: 11 - Favs: 16 - Follows: 11 - Updated: 10/21 - Published: 8/3 - Complete