Bruce Wayne's Red Flash at the end of season 9 episode one explained. In The Flash season 5, a recording from the future name-dropped Red Death.In an alternate timeline in the DC Universe, Batman endeavored to become a better superhero by stealing the Speed Force from Barry. After fusing with the hero, Bruce Wayne transformed into a villain known as Red Death. The Flash's reference to the character implied that at some point in Barry's Arrowverse future, he too would have to go up against an evil Dark Knight. But after season 8's "Armageddon" event mentioned a female speedster called the "Lady in Red," it was postulated that the Arrowverse's Red Death in fact was in fact someone other than Bruce Wayne.

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