The Legends travel back to the Old Wild West and gain the aid of a true legend, a morally ambiguous gunslinger with a penchant for danger, Jonah Hex, who has been battling outlaws and gangs and happens to know a thing or two about time travel. Hex warns the Legends to be extra careful in their journey to the small town of Salvation.

After the numerous sacrifices the team has made since the beginning of this ride, Rip decides that it’s time they each decide their own destiny and returns them to Central City a few months after they first left. Returned to their normal lives, each team member must individually decide if they are willing to sacrifice everything in order to save the world. Meanwhile, Sara visits with her father who delivers some heartbreaking news about her sister.

Dr. Nate Heywood, an unconventional historian, makes a shocking discovery. Nate then seeks out Oliver Queen for help to find the scattered Legends. Once reunited, they try to protect Albert Einstein from being kidnapped before the Nazis destroy New York City with a nuclear bomb. Meanwhile, Ray notices that Sara has a mission of her own, which leads them both to face her nemesis, Damien Darhk.

After learning the Dominators’ plan for the world, the Legends must work together with The Flash, Supergirl and Green Arrow to kill them once and for all. Meanwhile, Stein figures out, with the help of others, how the team can terminate the Dominators, but is distracted by the aberration he realizes he created in 1987.

The crossover starts on Supergirl S02E08 Medusa (I), The Flash S03E08 Invasion! (II) and Arrow S05E08 Invasion! (III).