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.

When a malfunction sends the Waverider crashing into 2046 Star City, our heroes face a startling version of their own future where they never stop Savage and never return home. The city is in ruins and overrun by criminals, which thrills Rory. Sara is despondent over the destruction of her home and stunned when she learns what happened to her old friend, Oliver Queen.

Rip tells the team they are headed to the future to take out a powerful ally that Savage needs in order to conquer the world. However, when Rip reveals the ally is a 14 year-old boy who will one day grow into an evil dictator, the team is split about the morality of killing a child, even if it does save the world. Meanwhile, Sara talks Snart through a rough patch and Ray learns something that could impact his future with Kendra.

The Legends discover a time aberration in 1863 and must fight for survival during the Civil War with Confederate soldiers who have been turned into zombies. With the Civil War outcome hanging in the balance, Jax participates in a daring mission by going to a slave plantation with Amaya. Meanwhile, Sara begins to feel the burden of the decisions she has to make as the leader; and Ray struggles to find his purpose on the team.

The Legends are determined to find and rescue Rip, but first must focus on locating the Spear of Destiny. Stein thinks he has the perfect person to help but knows involving her will be risky. Meanwhile, Malcom Merlyn and Damien Darhk realize that Thawne is pitting them against each other.

When a massive timequake rocks the ship while the legends are preparing for their next destination, they must break a cardinal rule of time travel.

When the Legends realize that they broke the timeline, Rip Hunter arrives with his new organization - the Time Bureau - to relieve them of duty. The Legends are thrilled to get a chance to put the team back together but a new threat arises when Rory spots Julius Caesar in Aruba. Sara, Nate and Ray devise a plan to steal the Waverider back from the Time Bureau in order to try and stop Julius Caesar from conquering the modern world.

The Legends plan to vanquish Mallus by using the totems doesn't go as planned, forcing Rip to improvise. The team finds itself regrouping in the Wild West where they run into their old pal Jonah Hex. Sara leaves Ray in charge of watching Damien Darhk, while she comes up with a new plan. Meanwhile, Amaya is determined to find a way to use the totems to destroy Mallus.