Barry, Oliver, Sara, Alex, Martin and Jax wake up in a Nazi concentration camp on Earth-X, with power dampening handcuffs.
The leader of the concentration camp is revealed to be the Earth-X doppelgänger of Quentin Lance, who takes them away for execution, before they are saved by Citizen Cold (the Earth-X doppelgänger of Leonard Snart). Snart takes them to a resistance bunker, where the team meets fellow resistance fighters Ray Terrill and General Schott (Winn Schott's doppelgänger).
It is revealed the only way back to Earth-1 is through a temporal gateway in a Nazi facility, which Winn plans to blow up to destroy the enemy's doomsday device.
Oliver disguises himself as his Earth-X doppelgänger to infiltrate the facility, discovers the Nazi's doomsday device against the multiverse is a militarized timeship called Wellenreiter, and saves a prisoner (who is Felicity's Earth-X doppelgänger) from Quentin.
Barry and Ray battle the Earth-X Red Tornado, while the rest of the team enters the facility. In attempting to reactivate the portal, Stein is shot and gravely wounded.
Back on Earth-1, Thawne prepares to perform surgery on Kara to save Overgirl. Felicity and Iris try to stop him, but are captured.
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