Since The Flash is also a multiverse story, it brings in characters like Sasha Calle's Supergirl and Michael Keaton's Batman. But those two are not the only characters from other DC universes to get appearances or cameos in The Flash.
Since The Flash is also a multiverse story, it brings in characters like Sasha Calle's Supergirl and Michael Keaton's Batman. But those two are not the only characters from other DC universes to get appearances or cameos in The Flash.
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