Board Thread:Supergirl discussions/@comment-27399439-20171107183119/@comment-27700324-20171128182721

Dragonfly82 wrote: What if they mention Earths more after 53. Earth-X isn't Fifty Three, it is just a seperate Earth called Earth X.

Earth Fifty Three doesn't exist due to the 52 rule established in DC's New 52 relaunch to simplify the multiverse.