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Crisis on Earth-X logo

Crisis on Earth-X is the name of the 4 part crossover event between Supergirl, Arrow, The Flash and DC's Legends of Tomorrow. The crossover aired over two nights from November 27th to November 28th, 2017. The episodes that were involved in the crossover were:

Synopsis

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.[1]

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