One of the biggest questions to come out of Supergirl switching networks from CBS to The CW was just how they were going to get the Supergirl world to merge with that of all the DC shows already on the network. After all, there wouldn't be as much fun to be had in the switch if the Supergirl universe stays completely separate from the Arrow-verse. Now, we have an idea of how that miraculous act is going to happen, thanks to executive producer Andrew Kreisberg.
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.
Before the show headed to The CW, there were various theories about how to get Kara and her Supergirl universe merged with the Arrow-verse. One popular theory was to use the Flashpoint storyline in The Flash to get Supergirl and her team into the mix. At the end of last season, we watched as Barry Allen sped back in time and saved his mom from Reverse-Flash. Last week, he realized it was a big mistake and attempted to put everything back to normal, only to find out that his actions made some changes to his real timeline that can't be easily fixed. The thought was that those changes to the "real" timeline would allow the Supergirl universe to become one with the Arrow-verse. The other idea, however, seems to be the one the creative team opted to go with.
It sounds, though, from Andrew Kreisberg's words to Entertainment Weekly, that he and the others behind Supergirl will not be taking that relatively easy way out. Instead, it seems that we'll be treated to a something that's a lot more like what happened when The Flash ran his way to Supergirl's universe and National City last season; Kara will be able to visit the Arrow-verse, but her friends will still be in their own world, where The Flash, Green Arrow and the heroes and villains they know don't exist.
Honestly, I think this is for the best. As I mentioned earlier, using Flashpoint would have been a very easy way for the two dimensions to collide. Maybe, it would have been too easy. Sure, the audience would have known the reason why Kara, Alex, Winn and the rest of the denizens of National City were suddenly a part of the same world as Barry and Oliver, but it still would have been odd to have a change so big just happen. Not to mention the fact that the change wouldn't have received much, if any fanfare, something that should happen with a move this big. I mean, we're talking about aliens suddenly existing in the world, that kind of needs to be discussed.
Well, if you're like me, you're even more intrigued with how these crossovers are going to go down between Supergirl, The Flash, Arrow and Legends of Tomorrow. Stay tuned to Supergirl Mondays at 8 EST on The CW to see how Kara makes it to the Arrow-verse.