The Flash Season 9 May Have Broken A Big Post-Crisis Arrowverse Rule

Warning: The following contains SPOILERS for The Flash season 9, episode 4, "Mask of the Red Death, Part 1."The existence of the Red Death in The Flash season 9 calls into question the rules regarding doppelgängers in the Arrowverse following the "Crisis on Infinite Earths" event. Granting that the exact rules have been inconsistently portrayed between the various superhero series making up the Arrowverse, the truism that travel between alternate Earths is now all but impossible had been upheld until now. Thankfully, loopholes explanations could explain the apparent inconsistency, ranging from the ill-defined power of the Negative Speed Force to a quantifiable difference between alternate timelines and alternate Earths.
The complication arose in The Flash season 9 episode 4, "Mask of the Red Death, Part 1," where it was confirmed that the villainous speedster Red Death is a variant of Batwoman Ryan Wilder from another timeline. This Ryan Wilder claimed to have come from a world where The Flash had become a villain but was soon exposed as a paranoid murderer corrupted by the Negative Speed Force. While it was explained how the Red Death had accidentally traveled to Earth-Prime after being thrown out of the Speed Force, it was unclear just how she was able to function given the rules regarding doppelgängers laid out after "Crisis on Infinite Earths."


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