“Crisis on Earth-X” is the fourth annual Arrowverse crossover event, featuring episodes of the live-action television series Supergirl, Arrow, The Flash, and Legends of Tomorrow on The CW. The crossover will begin on November 27, 2017, with Supergirl and Arrow, and conclude on November 28 with The Flash and Legends of Tomorrow. “Crisis on Earth-X” sees Barry Allen and Iris West’s friends come to Central City for their wedding, only to be interrupted when villains from Earth-X disrupt the proceedings.
Development for a crossover between the four series began in December 2016 after the release of the previous crossover, “Invasion!”. The premise and title of the crossover were revealed in September 2017 as production on the episodes began, with it noted that elements from the animated web series Freedom Fighters: The Ray would be part of the crossover, including the live-action appearance of Ray Terrill / The Ray.
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