After the defeat of Eobard Thawne and his equally nefarious Legion of Doom, the Legends face a new existential threat created by their actions at the end of last season. In revisiting a moment in time that they had already participated in, they have essentially fractured the timeline and created anachronisms - a scattering of people, animals, and objects all across time! Our team must find a way to return all the anachronisms to their original timelines before the time stream falls apart. But before our Legends can jump back into action, Rip Hunter (guest star ARTHUR DARVILL) and his newly established Time Bureau call their methods into question. With the Time Bureau effectively the new sheriffs in town, the Legends disband - until Mick Rory (series star DOMINIC PURCELL) discovers one of them in the middle of his well-deserved vacation in Aruba. Seeing this as an opportunity to continue their time-travelling heroics, Sara (series star CAITY LOTZ) wastes no time in getting the Legends back together. She reunites with billionaire inventor Ray Palmer (series star BRANDON ROUTH), the unconventional historian-turned-superhero Nate Heywood (series star NICK ZANO), former member of the JSA Amaya Jiwe aka Vixen (series star MAISE RICHARDON-SELLERS), and Professor Martin Stein (series star VICTOR GARBER) and Jefferson "Jax" Jackson (series star FRANZ DRAMEH), who together form the meta-human Firestorm. Once reunited, the Legends will challenge the Time Bureau's authority, and, in true Legends style, eventually run afoul of the Bureau when they recruit a hacker from the future, Zari Tomaz (new series regular TALA ASHE). Against the wishes of the bureau, they welcome Zari to the team and continue their time travelling shenanigans, while insisting that however messy their methods may be, some problems are beyond the Bureau's capabilities. Some problems can only be fixed by Legends.