'Legends of Tomorrow' Season 2, Episode 7: 'Invasion!'
This week, the Legends are caught up in the week-long "Invasion" crossover with Supergirl, The Flash, and Arrow. This climactic episode sees the heroes from all four shows developing a plan to defeat the alien invaders, the Dominators. The episode was directed by Gregory Smith. Phil Klemmer and Marc Guggenheim wrote the script from a story by Greg Berlanti.