Supergirl made quite a splash last week when it finally revealed it's first trailer, an extended 6 minutes of DC action that pleased fans and critics alike. It was followed by a theatrical style trailer that only continued the excitement. Now, we get Melissa Benoist as Kara Zor-El on the cover of this week's Variety, and she is joined by producer Greg Berlanti and none other than The Flash star Grant Gustin. Does this mean a small screen crossover for both heroes is in the works?

Probably not. At least not in the first season of Supergirl, anyway. CBS has made it clear that they want their first DC Comics character to stand on her own without the help of another Network's character coming into the mix. While the network is against the initial idea of a TV crossover, Greg Berlanti is not. In fact, he is strongly championing the idea. He tells Variety:

RELATED: Has The Flash Finally Wrapped Filming?
"The network has said publicly at this point they're going to keep her to themselves. I always approach the shows as a fan first, so I would love to see (a crossover). I think in success, all things are possible. But there's a lot that would have to happen before everybody might say yes to that."

Just last week, Arrow star Stephen Amell promised to crossover as Oliver Queen if a network or streaming service decided to pick up Constantine after it was canceled by NBC. The actor revealed that, despite these DC shows being on different networks, they can all still crossover, and that has been discussed within DC and Warner Bros. television, which own the rights to all these characters. So, it's plausible that these shows can crossover, but it's up to the Networks and creators to agree on the right way to make that happen. And all new contracts have to be created with the stars. As Greg Berlanti is behind Arrow, Supergirl and The Flash, a crossover between these shows is more likely to happen than something featuring the characters of Gotham or Titans. And there is no telling if Constantine will even come back. While we await any official word, take a look at what it might look like when and if a Network crossover ever happens:

Flash Supergirl Variety Cover