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"Nazis? I hate Nazis."
Oliver Queen, Barry Allen, and Kara Danvers[src]

Crisis on Earth-X is the name of the fourth annual Arrowverse crossover event between Supergirl, Arrow, The Flash and DC's Legends of Tomorrow. The crossover aired over two nights from November 27 to November 28, 2017. It served as a set-up for the animated web series Freedom Fighters: The Ray.


Barry and Iris's wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony. All of the superheroes band together with help from their super friends like Citizen Cold, The Ray, Felicity Smoak, Iris West and Alex Danvers to take on their most formidable villains yet. Earth's mightiest heroes – Green Arrow, Supergirl, The Flash and White Canary – lead their teams into battle to save the world.[src]



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Nazi regime ruled the parallel world of Earth-X, where an archer known as Dark Arrow was the Führer. He seized a temporal gateway from the Freedom Fighters, which enables traveling to other universes. On Earth-1Barry Allen and Iris West's friends, including Kara Danvers and Alex Danvers from Earth-38, came to Central City for Barry and Iris's wedding. Harry WellsCisco Ramon, and Caitlin Snow developed a serum to separate the Firestorm Matrix from Martin Stein and Jefferson Jackson. However, Jefferson was reluctant to give up being FirestormOliver Queen re-proposed to Felicity Smoak, but she was hesitant about marrying him. The wedding ceremony was interrupted by invaders from Earth-X led by Dark Arrow, Overgirl, and Prometheus. After Kara injured Overgirl, and Alex and Sara Lance captured Prometheus, the Nazis retreated. Dark Arrow and Overgirl, who were Oliver and Kara's Doppelgängers respectively, discussed their next steps with Eobard Thawne, Barry's speedster nemesis who was previously presumed dead.

In S.T.A.R. Labs, Prometheus revealed himself as Tommy Merlyn's Earth-X doppelgänger, then took a suicide pill out of loyalty to the New Reich after taunting Oliver. Harry revealed that through his exploration of the multiverse, he discovered that Earth-X was a dystopian world where World War II was not won by the Allied Forces. Dark Arrow, Overgirl, and Thawne sole an experimental sub-light generator, the Prism, from a research company. Oliver's team, along with Harry, Caitlin, Cisco, and Mick Rory, were in captivity at S.T.A.R. Labs after the Nazi forces occupied it. Oliver, Barry, Sara, Martin, Jefferson, and Alex were abducted to a concentration camp on Earth-X, while Kara was moved to S.T.A.R. Labs. Overgirl is dying from disproportionate insolation in her heart and Dark Arrow planned to use the Prism, powered by the S.T.A.R. Labs particle accelerator, to create artificial red sunlight that can weaken both Karas' invulnerability, allowing Thawne to conduct a heart transplant from Kara to Overgirl.

In the concentration camp, the heroes were rescued from execution at the hands of SS-Sturmbannführer by Ray Terrill and Leo Snart. Thawne prepared to operate on both Overgirl and Kara, while Iris and Felicity worked to rescue their friends at S.T.A.R. Labs. General Winn Schott, the commander of the Freedom Fighters, was determined to strand Dark Arrow and Overgirl on Earth-1 by destroying their temporal gateway. While posing as Dark Arrow, Oliver discovered the Nazis' doomsday device, a Timeship called Wellenreiter, a militarized equivalent of the LegendsWaverider. Oliver allowed the timeship to enter Earth-1 to avoid jeopardizing his cover, but he is ultimately exposed when he refused to kill Felicity Smoak's Earth-X doppelgänger, a concentration camp prisoner. The heroes struggled against both the Freedom Fighters' Red Tornado, deployed by Schott as a failsafe, and the Nazi forces and the gateway's portal is opened at the cost of Martin being mortally wounded.

The heroes returned to Earth-1, and Iris, Felicity, Kara, and the others were rescued by the returned heroes and the Waverider crew. Jefferson was also affected by Martin's injury, so Martin used the serum to separate the Firestorm matrix and died from his wounds. Jefferson tells Martin's family of his fate; they along with the Legends and Barry's team were devastated by Martin's death. His death spurred the heroes to declare war on Earth-X's Nazi forces. When the Nazis attacked Central City, the heroes countered their assault. Harry, who piloted the Waverider, destroyed the Wellenreiter after the heroes disabled its shield. Barry spared Thawne, who vowed to return. During the fight with Kara, Overgirl's solar radiation went nuclear and Kara carried her into space, where Overgirl exploded. Oliver killed Dark Arrow soon after. After Martin's funeral, Kara and Alex returned to Earth-38, Ray returned to Earth-X, and Leo decides to remain with the Legends. John Diggle, an ordained minister, officiated Barry and Oliver's weddings, with Iris and Felicity respectively.


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