DC Comics Superheroes are really taking over the TV scene. After "Arrow" and "The Flash" successfully executed their crossover, it was suggested that Supergirl join in the fun.

However, the idea has been shut down by CBS Entertainment president, Nina Tassler, who spoke to Gary Levin in the Television Critics Association press tour. Levin tweeted:

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"Don't look for crossovers between #Supergirl and #Arrow, on sibling networks. But they'll run promos for each other. #TCA15

So there won't be any scene of Supergirl swooping down on Starling City. Or maybe there will be. If that sounds confusing, here's the full response from Tassler herself as she spoke to IGN:

"Here's the deal. I'm a little bit of a superhero geek and I have a lot of respect for what characters inhabit certain universes," she explains. "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," continued Tassler.

Tassler seemed pressed for an answer, and the short answer is "no." But that was not what the fans wanted to hear, though. Just to say that the door is open to the possibility and perhaps in future seasons, the sibling networks can work it out.

Meanwhile, fans continue to crave for more heroes on TV. If the characters with established universes and TV series can't be touched, how about someone closer to home like Superman?

The answer was similar to Tassler's. Executive Producer Geoff Johns addressed the query from the reporters.

"He will be a factor in her life but you won't see him exactly on screen; he'll be in the background but he does play a part in her evolution," as quoted by THR.

This was supported by co-showrunner Ali Adler: "As much as we respect the history of Superman, it's very much [Kara/Supergirl's] point of view."

The show's producers believe that the success of the superhero series was gained by establishing firm and solid universes and deep-rooted characterization. Simply throwing more and more costumes in the show is not an effective formula.

Tagssupergirl, The Flash TV series, Arrow TV Series