Barry Allen and Iris West are set to get married, kicking off the 2017 four-episode crossover of the Arrowverse, including the CW TV shows Supergirl, Arrow, The Flash, and Legends of Tomorrow. The ceremony is interrupted by invaders from the parallel world of Earth X, where the Axis powers won World War II. Anthony Brown and Chris Borthick discuss the four-part series with Matthew Price in this 2017 archive episode.

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