How Superman Links To Bizarro: New Arrowverse Doppelganger Rules Explained
Warning! SPOILERS for Superman and Lois season 2 and Legends of Tomorrow season 7.
Superman and Lois season 2 introduced Bizarro Superman into the Arrowverse, alongside an unexplained connection to Superman that hints at Bizarro being a multiverse doppelganger. This has called into question the new Arrowverse rules regarding doppelgangers existing on the same Earth following Crisis on Infinite Earths. To further complicate the matter, later that week, a variant of the Reverse-Flash was revealed to still exist on Earth-Prime in Legends of Tomorrow season 7, episode 10, «The Fixed Point.»
Doppelgangers are the alternate versions of familiar characters from other Earths in DC Comics' multiverse. The concept has been a core part of the Arrowverse mythology since The Flash season 2, which introduced Earth-2 and Harrison «Harry» Wells, who was that world's version of STAR Labs' founder Harrison Wells. Actor Tom Cavanagh famously played multiple Harrison Wells doppelgangers over the first seven seasons of The Flash, but the doppelganger concept was brought into other Arrowverse series, such as when Arrow reintroduced the villainous Black Canary of Earth-2, Black Siren, as a recurring character.
Related: Superman & Lois Revives The Arrowverse's Oldest Cliché (With A Twist)
When the realities of the many series making up the Arrowverse merged into a single world, Earth-Prime, following the Crisis on Infinite Earths crossover event, doppelgangers became much rarer. While there were still multiple Earths making up the cosmology of the new Arrowverse, travel between them became impossible using the old methods and there was no evidence of any heroes who had the power to travel between universes (like Breacher of Earth-19) having
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