DC's Legends of Tomorrow (2016)

Episode Overview

Upon discovering the Dominators' sinister intentions for Earth, the Legends join forces with The Flash, Supergirl, and Green Arrow to eliminate this threat once and for all. As they strategize, Stein uncovers a method to defeat the Dominators with assistance from his teammates, but he becomes preoccupied by an anomaly he inadvertently caused back in 1987. The crossover begins with Supergirl S02E08 Medusa (I), followed by The Flash S03E08 Invasion! (II), and Arrow S05E08 Invasion! (III).