Ep 7. Invasion!

The DC's Legends of Tomorrow season 2 episode 7, titled "Invasion!", revolves around the arrival of the Dominators on Earth. The Dominators are an alien race that the government has known about for quite some time, and they have been monitoring their activities. The arrival of the Dominators prompts the government to call upon all the superheroes to join forces and fight against the alien race.

The Legends are assembled by the government, and they are tasked with recruiting all the other superheroes that will help fight against the alien race. However, not all superheros are willing to join forces, and some express their dismay at being forced to join the fight.

The team travels to the future and recruits Arrow, The Flash, and Supergirl to help fight against the Dominators. While the heroes are battling the aliens, the team discovers that the Dominators are using mind control to force people to do their bidding, which makes it even more difficult to overcome the alien invasion.

The episode is filled with action-packed scenes as the superheroes fight against the Dominators. There are also several emotional scenes as some of the heroes reveal their personal struggles and doubts about their ability to fight against such a powerful alien race.

Overall, the episode is a thrilling adventure that brings together some of the most popular superheroes from the DC universe. Fans of the show will enjoy the crossover between Arrow, The Flash, and Supergirl, as well as the high-intensity battle against the Dominators. The show does an excellent job of incorporating several different storylines, while still keeping the focus on the main mission to defeat the alien race.