By Natalie Abrams
March 19, 2017 at 07:11 PM EDT
Diyah Pera/The CW

Could there be a version of Kara Danvers on Earth-1? That’s the looming question following the big crossover between The Flash, Arrow, DC’s Legends of Tomorrow and Supergirl.

While viewers previously knew that Kara hailed from a different universe — Earth-38, to be exact — it hasn’t been made clear whether a version of Melissa Benoist’s Supergirl character resides on Earth-1. The chances that Krypton would be destroyed in this universe, and a pod housing Kara Zor-El landing on Earth-1, where she’d then be taken in by the Danvers family seem rather slim. However, the powers that be behind the Berlanti-verse haven’t ruled out introducing Power Girl. In the comics, Power Girl (a.k.a. Kara Zor-L) is the cousin of Superman, but from an alternate universe — specifically Earth-2.

“We hadn’t discussed [introducing Power Girl] formally, but I think that certainly after these three episodes, there’s literally no limit to the things that we can do,” executive producer Andrew Kreisberg says.

After Ray’s (Brandon Routh) comment during the crossover that Kara looked like his cousin, some viewers hoped that meant Benoist was primed to play the relative of Ray Palmer. Alas, it was more a sly nod to the fact that Routh previously portrayed Superman. “It was a throwaway [line],” executive producer Marc Guggenheim says. “It was a total throwaway.”

“Last year on Legends, we did the prison break,” Guggenheim continues. “I said to the writers, ‘If we don’t make a Prison Break joke here with Wentworth [Miller], we’re not doing our jobs.’ I was like, ‘If we have Brandon and Melissa share the screen, and we don’t make some sort of joke like that, we’re not doing our job.’ The truth is, that joke existed on Arrow originally, and then a certain scene got cut, so then I moved it over to Legends; I just kept moving it back and forth. I’m like, ‘I’m getting it in one of these episodes!'”

The good news is that viewers may get to see more of these characters crossing universes now that Cisco (Carlos Valdes) devised an interdimensional extrapolator, which essentially creates small breaches so that Supergirl can cross over to, or communicate with, this universe whenever she wants — which will likely come in handy for the upcoming Supergirl-Flash musical crossover.

“The [crossovers have] gotten to the point where we wanted to make that a little bit easier,” Kreisberg says. “The next time we do it, it means it doesn’t necessarily have to be because Oliver and Barry need Kara; it could be because Kara needs them. We don’t have anything planned. We just barely survived this one, so we’re not too concerned with what we’re going to try to do next year, but it just gives us another way to come at a story.”

Does that mean the heroes of The Flash, Arrow, and Legends could head to National City? “Maybe next year,” Kreisberg says.

And though Kara may be gone, she’s certainly not forgotten. “These people all do know each other, and they’re all friends,” Kreisberg says, noting that shoutouts to Kara on other shows will be seldom, but moments like that are vital to the success of these shows. “Hearing those little shoutouts along the way I think does a service to the relationships that they’ve all formed — that it isn’t like the crossovers of the ‘80s where they’d see each other for that one episode and then it was like it never happened. These things do happen, and they do have ramifications, and not all of the ramifications are always bad; some of them are good, because now these people have these amazing relationships that can continue on.”

Read more:

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The best nods to the past in Arrow’s 100th episode

Supergirl boss on what’s next after those winter finale reveals

Arrow EP reflects on 100 episodes

EW’s cover story on the four-way crossover

What was cut from the Arrowverse crossover?

The Dominators will return on Supergirl — here’s why that’s scary

Invasion vs Arrowverse: Here’s what’s different from the comic

The Flash: More Flashpoint repercussions to come, but…

Why Lynda Carter wasn’t the Earth-1 POTUS of the Arrowverse

Legends of Tomorrow: Has Sara given up hope of saving Laurel?

Supergirl will return in 2017, while the winter finales of The Flash, Arrow, and DC’s Legends of Tomorrow air Tuesday, Wednesday, and Thursday, respectively, at 8 p.m. ET on The CW.