Oliver, John, Laurel and Tatsu seek out an important person within The Monitor's plan; Connor has a heart to heart with his brother.
The Legends see a horrific version of the future when they crash into Star City in 2046. Sara gets a further shock when she meets Oliver Queen.
Snart and Sara attempt to rescue their fellow Legends from certain death in a Soviet gulag. Rip gives Sara a secret and potentially-fatal assignment.
During an investigation into a suicide bombing at the U.S. Marine base, a discovery is made about a new, chemically undetectable bomb material. Meanwhile, Gabriel is unable to finish a task.