The Legends learn that Ray Palmer will die because they broke time, so they race back to 1988 to try and save his life. When they arrive, they learn that young Ray Palmer has befriended a time-displaced baby Dominator, putting him in harm's way with the government and the Dominator's mother. New to the ship and missions, Zari must find her place and learn to trust the team. Meanwhile, Stein begins working on a secret project on the ship, which makes Rory and Jax suspicious.
Sara travels to the future to capture a rogue time traveler, but the Legends disrupt things by trying to protect an outlaw named Zari in order to hopefully lure in the time traveling assassin. Meanwhile, Stein tries to diagnose Amaya's condition, but Nate discovers an unusual treatment that Amaya begrudgingly agrees to undergo.
The Legends are in 1870 to fix the anachronism which happens to be at P.T. Barnum's fledgling circus. However, Nate and Ray accidentally free a saber-toothed tiger, creating a bigger problem. Meanwhile, P.T. Barnum is on the hunt to capture Nate and Ray to make his show even more exciting for the crowd.
The Legends are relived of duty by the Time Bureau when they break the timeline, as Season 3 begins. Meanwhile, Julius Caesar is spotted in Aruba, and Sara, Nate and Ray devise a plan to steal the Waverider back from the Time Bureau to stop Julius Caesar from conquering the modern world.