Board Thread:The Flash discussions/@comment-9346948-20161123011226/@comment-27700324-20161127042343

Kaestal wrote: Xandermcc wrote: Kaestal wrote: Xandermcc wrote: Kid Devil isn't an Arrowverse character, Martian Manhunter is though. He's a Supergirl character, not Arrowverse. He is a part of the Arrow multi-verse the same way Jessie Quick is. I'd consider the Supergirl characters part of the Arrowverse once they actually visit Earth-1, not the single way crossover we got.

H.R and the others did have a two-way crossover because of Harry's message and Jay Garrick could've taken Barry to 1980 or 90 of Earth-3. Sorry, but by canon, the characters are in the same multiverse.

I think that Earth 3 is in some world where they still are in the 90s during present day.