Casting is now underway — courtesy of the same folks who populated Arrow and The Flash — for CBS’ Supergirl series, and TVLine has details on exactly what (and who) the DC Comics-based drama is looking for in two of its lead roles.

For Kara Zor-El aka Kara Danvers, the show is eyeing Caucasian females, age 22 to 26, to play 24. As the series’ mythology goes, Kara at age 12 was sent from her dying home planet of Krypton to Earth, where she was taken in by the Danvers, a foster family who taught her to be careful with her extraordinary powers. After repressing said skills for more than a decade, Kara is forced to bust out her super moves in public during an unexpected disaster. Energized by her heroism for the first time in her life, she begins embracing her abilities in the name of helping the people of her city, earning herself a super moniker along the way.

The other lead role currently being cast is that of 26-year-old Alexandra “Alex” Danvers, Kara’s gorgeous, brilliant, science-minded foster sister. Growing up, Alex was partly jealous of her sibling yet also fascinated by her abilities, prompting Alex to learn as much as she could about alien anthropology, sociology and culture. Today, Alex works for a secret government organization and, alongside her heroic sis, will face many challenges, both mundane and super.

The Supergirl pilot was penned by Ali Adler (No Ordinary Family) and Greg Berlanti (Arrow), both of whom will exec-produce alongside Sarah Schechter (of Berlanti Productions) and Warner Bros. TV.

In a recent interview with EW, Berlanti revealed that he's currently working on the show with producer Ali Adler and costume designer Colleen Atwood, and that he's hoping to bring Supergirl into The Flash and Arrow’s world.

In regards to his plans with Supergirl:

“Later in the afternoon at his other office on the Warner Bros. lot, Berlanti meets with fellow producer Ali Adler and Oscar-winning costume designer Colleen Atwood to go over looks for their upcoming revamp of Supergirl. The show will follow 24-year-old Kara Zor-El, Superman’s cousin, and with a twist that that could melt fanboy brains, Berlanti says it’s possible this Supergirl could enter the worlds of Arrow and The Flash.”

There’s that shared universe concept that a lot of us of are divided on; I would say in this case that it might benefit all parties involved to have that female addition. Last month we learned that the Supergirl show will include Kara Zor-El, aka Kara Danvers, and Alexandra “Alex” Danvers, and now Berlanti has hinted about what happens to the title character in the pilot episode:

“The events of the pilot get her to finally emerge as the true hero she was meant to be.”

It should be noted that even though Supergirl is on a different network, the CW is co-owned by CBS, so it wouldn't be as much of a stretch to have Supergirl appear when necessary. They're moving pretty fast by the sounds of things so expect to see something from Supergirl in 2015.

CBS has yet to cast its Supergirl, but the network gave some tantalizing details about what the network’s entry into the super-hero genre will be like.

Appearing at the Television Critics Association’s semi-annual press tour in Pasadena on Monday, CBS entertainment chairman Nina Tassler was pressed for details about Supergirl, while critics also wondered why the network swooped in and grabbed the show rather than putting the series on its sister network, the super-hero-stuffed The CW.

First, since Supergirl is on CBS, you can definitely expect the show to be a crime procedural. Yet Tassler emphasized the show will have serialized elements as well. “There will be cases, but what [executive producers] Ali Adler and Greg Berlanti pitched was a real series arc for her,” she said. “The beauty of it is now with shows like Good Wife and Madam Secretary, you can have serialized story elements woven into a case of the week. She’s a crime solver, so she’s going to have to solve a crime. She’s going to get a bad guy.”

Tassler described the CBS version of the DC Comics icon as “a very strong, independent young woman. She’s coming into her own. She’s dealing with family issues. She’s dealing with work issues. It’s a female empowerment story. If you look at the strong female characters we have on the air, it really is resonant of that … We’re big feminists. It’s her intellect, it’s her skill, it’s her smarts. It’s all of those elements. It’s not just her strength, which she does have.”

CBS has been searching for the perfect actress for several weeks and sources say the network is leaning toward a lesser-known performer for the role. Tassler emphasized the actress has to carry the series. “She’s got to be an every woman,” she said. “She’s got to be specific. She’s got to be a terrific actor. I think back to having had the good fortune of being at Warner Bros. when we were doing Lois & Clark, the chemistry between Dean Cain and Teri Hatcher was really wonderful. So I think in this case, it’s looking for someone who embodies both the freshness and the exuberance of being a young woman in today’s challenging climate and being someone who can carry this kind of series on her shoulders. It’s a big, big show.”

Though there’s no actress announced yet, CBS has a costume design ready to go — one that Tassler was most definitely excited about. “We have seen the costume,” she said. “Awesome costume.” Tassler added that the costume was being made by Oscar winner Colleen Atwood, who also did the costumes for Arrow and The Flash.

And speaking of which, reporters also wanted to know what made the young-ish super-powered character a good fit for CBS — especially when sister-network The CW has made youthful DC heroes a major part of its brand. “I think we’re watching an evolution with regard to the way that superhero characters are portrayed,” Tassler said. “There’s a humanity. They’re flawed. There’s a relatability. For our network right now, what we did respond to was the character’s humanity, the other characters in the show as well — the story trajectory and the character’s arc and growth. These are all things that made her just imminently relatable, and made the story exciting. We made a decision based on the pitch that we heard.”

Earlier during the press tour, The CW’s president Mark Pedowitz was asked if he was dismayed that CBS landed the big title instead of his own network. Not surprisingly, the executive said he was fine with it. “I’m happy for [Warner Bros.] that they were able to sell it to CBS. We were aware of it. We knew about it … You don’t want to become just one thing to everybody. So it’s good to have some diversity, and I’m very happy that they sold it to another network.”

Pedowitz added that he wouldn’t rule out the possibility of a crossover between his DC titles like Arrow and The Flash.

Supergirl has a series commitment but no premiere date yet, but next fall is a good bet.