Time Master Rip Hunter puts together his diverse team to fight immortal villain Vandal Savage who is on the verge of destroying humanity in 2166.

The team battles Vandal Savage, and Atom's suit falls off and lands in the wrong hands. Stein realizes the best way to retrieve it is by contacting his younger self. Snart and Rory plan to steal a key element in defeating Savage. Carter helps Kendra remember something vital.

Rip decides to weaken Vandal Savage by going after his financial assets. Rip and Sara infiltrate Savage’s bank, but are discovered by his men. Snart and Rory talk Jax into taking the jump ship back to Central City so they can steal a valuable emerald.

Rip takes the team to London in the year 2166, three months before his family is killed. He believes this to be their final opportunity to take out Savage who is, unfortunately, at the height of his power. However, the team discovers two key elements to defeating him – Savage’s daughter and the means to kill Savage once and for all.

After numerous attempts in many different time periods, the team has successfully captured Vandal Savage. However, Savage tells Kendra that he can reunite her with Carter so she struggles with whether she should kill him. Rip decides they will deliver Savage to the Time Masters which doesn’t sit well with Snart and Rory. The duo decides it may be time to jump ship and return to their old life. Meanwhile, Savage taunts Ray about his place in Kendra’s life.

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.

With Astra, Spooner and a now-human Gideon trying to save the Legends, Gideon becomes overwhelmed by her new human choices sending her into a catatonic state. Astra and Spooner combine their powers to enter Gideon's mindscape and discover that a virus is trying to erase all of Gideon's memories. Acting fast, they devise a plan to defeat the virus before it's too late. Meanwhile, the Legends are about to go up against a powerful new foe.