What is Elseworld and what can we expect from the epic Arrowverse crossover?

The heroes of Arrow, Supergirl, The Flash and Legends of Tomorrow, came together last year to stop a Nazi invasion on Earth-X. This year, we move to the 'Elseworld'.

The fans have been stunned and confused ever since 'The Flash' saw Barry Allen hop dimensions into Earth-2. The CW has clearly tested the narrative limits of the multiverse and the fans have been wanting to see more. Last year, the heroes of Arrow, Supergirl, The Flash and Legends of Tomorrow, came together to stop a Nazi invasion from Earth-X. This year, the Arrowverse will unite again to deal with 'Elseworld'. 

What do we know about Elseworld, though? Elseworld was a DC Comics imprint established in 1989 which published stories of DC characters that happened outside the core continuity. This allowed the creators to be super creative with wild concepts like, what if Superman landed in Russia as a baby? reported Inverse.

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