Dr. Nate Heywood, an unconventional historian, makes a shocking discovery. Nate then seeks out Oliver Queen for help to find the scattered Legends. Once reunited, they try to protect Albert Einstein from being kidnapped before the Nazis destroy New York City with a nuclear bomb. Meanwhile, Ray notices that Sara has a mission of her own, which leads them both to face her nemesis, Damien Darhk.

The Legends travel to Nazi-occupied Paris and are surrounded by the Justice Society of America. They discover a time aberration that threatens the JSA, but the JSA doesn't want their help. Meanwhile, Nate tries to prove he should be part of the team.

When the Legends track Commander Steel to NASA Headquarters in 1970, they learn where Nate's grandfather hid the last fragment of the Spear of Destiny. The team notices a time aberration during the Apollo 13 mission and believes that the Legion of Doom might be involved. As the Legends journey into space to intercept Apollo 13, the Waverider suffers massive internal damage and Ray’s life is left in jeopardy when he is stranded on the moon. Meanwhile, tension grows between Rip and Sara as to who is the leader of the team.

When Mallus' power over Sara resurfaces, she unwittingly becomes the bearer of one of the Totems. Rory must conquer his dark side in order to wield his own Totem power to help save the crew. Meanwhile, Agent Sharpe notices that something is wrong and recruits someone unorthodox to help.