The Arrowverse has been slowly expanding. Starting off with Arrow in 2012, the universe that included Oliver Queen running around with vengeance on his mind and a bow and arrow in his hand, has grown to include The Flash and Legends of Tomorrow. But don’t look for Supergirl to be joining the shared universe any time soon.
When Grant Gustin’s Barry Allen crossed over to Supergirl last season, it was established that the cape-wearing Supergirl hailed not only from another planet, but also from another universe entirely than The Flash. And since The Flash has established that there are multiple Earths, better known as the multiverse, it was expected that Supergirl–which has moved locations and networks, from CBS to The CW–would merge into the shared Arrowverse.
But according to executive producer Andrew Kreisberg, that’s not going to be the case, at least not for the hero’s entire world.
Not for her entire world, but Kara will be traveling from her dimension to our dimension, “our” being the world that The Flash, Arrow, and Legends lives in.
So it looks like National City will remain on its own Earth and Supergirl will be the only one to go over to the shared universe during the four-show crossover airing at the end of November. Which makes sense. Just because Barry decided to Flashpoint, doesn’t mean it altered the timelines (and location) of any other Earth.
Supergirl’s second season airs on Monday, October 10 at 8/7c on The CW.