'Supergirl' plans to finally arrive to CBS in the fall, and there are fans that couldn't be more excited, however there are those that can't help but wonder why it wasn't picked up by the CW who has already crafted their own DC Comics universe.

Shows such as 'The Flash' and 'Arrow' have gained critical success on the network, and when 'Supergirl' was announced, it only made sense that it would follow up on the CW.

While the shows share the same producers, Greg Berlanti and Andrew Kreisberg, they are fated to exist on different networks, and in a recent press tour at the TCA's, CW President Mark Pedowitz answered the question as to why:

"I can't address CBS's perspective on that, but I can address ours. Last summer, Flash had not been the air yet. We had Arrow. We had Flash. And we were not planning to do another DC character. Supergirl was talked to from Warner Bros. to us. Because we weren't planning to do another DC character at the time, they took it out and they did the right thing. I hope them great success at CBS."

While this can be perceived as a negative thing, it hasn't ruled out the possibility of crossovers in both shows.

While CBS president Nina Tassler seemed to discourage the idea at first, she recently spoke on what would need to happen for it to take place.

"Here's the deal," she explained. "I'm a little bit of a superhero geek and I have a lot of respect for what characters inhabit certain universes. And people think, 'Oh yeah, just pick up one character and let them fly over!' If you're in another setting, you really have to be respectful and mindful of what each universe says you can and can't do. Obviously, we're working very closely with DC and our producers and Greg Berlanti is sort of the poster child for this field, so I'm just saying right now we're not doing it. We're doing it promotionally. But, look, we'll always stay open [to it]. They're very, very inventive in terms of what they can and will do in the future."