The 2017 team has no choice but to go back to 1916 and stop the Legion from getting the Spear of Destiny... even though if they meet their past selves it could a temporal calamity.

The Legion of Doom use the Spear to rewrite reality to their specifications. The Legends have no memory of their former existence, except for Mick... who is now partnered with Snart. However, Nate soon realizes that something is wrong and sets out to restore his teammate's memories.

After stealing the remaining Spear fragment from the Legion, the team realizes that the relic is too dangerous for anyone to possess it. Destroying the Spear requires the blood of Christ, and the only place it can be found is at the Battle of Somme in 1916. However, to find the blood, the Legends need the help of soldier J.R.R. Tolkien.

The Legends locate Henry Heywood in 1970, at Mission Control in Houston. They approach him and learn where he hid the fragment of the Spear... and that Eobard is planning to use Apollo 13 to gain the fragment for the Legion.

Rip forces Waverider down in 65 million B.C. While Ray, Nate, and Amaya seek out a lost piece of technology they need to restore the timeship, Jax and Sara enter Rip's subconscious in a desperate attempt to find the location of the last fragment of the Spear of Destiny.

After Rip takes a fragment of the Spear from JSA member Dr. Mid-Nite in 3000, the Legends travel to 507 AD to stop Rip and Damien from acquiring another fragment hidden at the court of King Arthur.

The Legends trace a timequake to Christmas Day, 1776... and discover that George Washington has been killed. They try to save Washington's life but the mission goes awry when Mick is captured by the British, Sara is shot, Ray is trapped at six inches, and Nate and Amaya are the only ones left to track Mick and the missing Washington.

While the Legends deal with Martin's daughter and try to work out the identity of the speedster opposing them, Malcolm and Damien have their own demands for Eobard while trying to tap into Rip's memories.

The team follow a temporal aberration to 1967 and find their former captain Rip Hunter... with no memory of who he is, and directing a student film. Damien and Malcolm arrive due to the Medallion, and the Legends soon realize that they're after something that Rip has... even if he doesn't know it.

The team travel to Chicago, 1927, to prevent a timequake and find Damian and the mysterious speedster responsible... and they've teamed up with Malcolm Merlyn. As the villains try to regain the amulet the Legends took from them, Mick is plagued by hallucinations of an old friend. Meanwhile, Martin reveals the existence of his daughter to Jax.

The abducted heroes return to Earth and tell the others about the Dominators' plans. Meanwhile, Martin deals with the daughter he never had until he altered the timeline, while Steel, Vixen, and Heat Wave go back to 1951 to capture a Dominator.

The team detects a timequake in 1874 and travel to Colorado, where they meet their former ally Jonah Hex. Jonah is on the trail of an outlaw, Quentin Turnbull, and the team realize that Quentin is the reason for the timequake. Meanwhile, Amaya gives Mick advice on controlling his rage, and Martin has memories of a woman he doesn't know.

The Legends trace a temporal aberration to the White House in 1987 and discover that Darhk is trying to obtain a rare item. Amaya teams up with a former JSA teammate, while Martin tries to convince his younger self to pay more attention to his wife before it's too late. Meanwhile, Mick has second thoughts about making Ray the new Captain Cold.

The team follows a stranded time pirate to Mississippi, 1863, and discover that the man has unleashed a bioweapon that transforms humans into zombie-like creatures. If they don't stop the zombies from overrunning Grant's army, history will be altered beyond repair.

Nate discovers that thanks to the Nazi serum, he can transform his skin into steel. However, in his first training session, he accidentally blasts himself and Ray out of the ship... and into 1641 Japan. Meanwhile, Jax and Martin discover a hidden compartment in Waverider and a cryptic message from a friend.

In 1942, the Legends are forced to team up with the Justice Society of America to recover a mystic amulet from the Nazis... unaware that Reverse Flash wants the Amulet for himself. Meanwhile, Nate meets his grandfather, Commander Steel, while Ray and JSA member Vixen bond.

Historian Hank Heywood notices the presence of the Legends in the past, and contacts Oliver Queen. The two of them find Waverider--and Mick--in the waters of the Atlantic. Once revived, Mick tells them what happened to the team in 1942.