The Elseworlds event took place from December 9 to December 11, 2018, on The CW.
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The event began with The Flash "Elseworlds, Part 1", continued through Arrow "Elseworlds, Part 2", and concluded with Supergirl "Elseworlds, Part 3". It also featured the Flash from The Flash (1990) (who was revealed to have been from Earth-90) and spun off Batwoman and her titular series.