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Supergirl, The Flash

CBS

After a straight-up delightful 40ish minutes of hanging out with The Flash—plus a huge, long-awaited kiss between two beloved characters—Monday's big Supergirl crossover got serious. Oh, you know, it's just that every human in National City marched onto the streets to join their similarly hypnotized brethren after Myriad finally went into action.

Just what, exactly, is the goal? We'll see in the coming weeks as we learn more and more about Astra's evil plan. In the meantime, here are some teases about what happened in the super-fun (ya know, until the end) crossover, what's to come in the future and whether we could potentially see Arrow join in on the crossover action.

1. Myriad is worse than we imagined, huh? "You finally found out what Myriad was, you're finally going to discover why Astra did it," teases executive producer Andrew Kreisberg. The whole "turning James into a zombie just after Kara finally mustered enough confidence to kiss him" thing is just the beginning.

Supergirl, The Flash

CBS

2. But there might be a point there. "In subsequent episodes you start to get very cogent arguments on the bad guys' side for why Myriad is the way to go," Kreisberg explains. "We always love it when the bad guys have a point—they're leaving out the part about killing a whole lot of people and you losing your free will, but next week Nan actually gives a speech where he talks about what has your free will gotten you? It's gotten you a planet full of reality TV shows and politicians who can't stand each other and you're all standing around, sitting by while global warming is going to destroy your planet. What if everybody was working in lock step? What if everybody was moving in the same direction? What if everybody was working together? Wouldn't that be better?"

3. Kara will have some help in saving the day. "She has a couple of surprising players that you wouldn't expect to be the two people who are completely unaffected by Myriad," Kreisberg says.

4. As for the crossover, could we see another soon? Yes, Kreisberg and EP Greg Berlanti say enthusiastically. It might even involve another superhero we know. "We always wanted to do it, just because I think from the day we cast Melissa [Benoist], the notion of her in scenes with Grant [Gustin] or someday, maybe in the best of all worlds with Stephen Amell as well … it's exciting to think of them on screen together."

5. Maybe Legends of Tomorrow, too. "The wave rider can do anything," says Kreisberg—even cross to other Earths in the multiverse.

Supergirl, The Flash

CBS

6. There's a reason why the first crossover took place on Supergirl. "Probably because [the episode involved Barry's] capacity to come this way," Kreisberg says. "We never really considered it the other way."

7. There's also a reason why we didn't see any doppelgangers. "We just wanted to make sure that Barry didn't have any other options to work with," Kreisberg says—but don't rule out seeing them in the future.

8. Another thing we won't see—at least not yet—is Project Cadmus. This DC Comics plotline is something that's been hinted at, but producers have ultimately run out of time to introduce it in season one. "You're not going to see Cadmus this season. It will be something that will be saved for season two. We did run out of runway a little bit," Kreisberg says. "It will remain an evil spectory thing that's out there but it's definitely something we're going to pursue. "

9. Something else we'll hopefully see in the future: Lynda Carter. "We had the perfect role for Lynda Carter but we couldn't work out her schedule. It was the biggest disappointment of the entire season," teases Berlanti of another DC small screen superhero. Wanna know what the woman also known as Wonder Woman was supposed to be? "Alright. She's the female president of the United States."

10. Last but not least: If Cat Grant can figure out who Barry is right away, why the heck doesn't she know her own assistant is Supergirl? "There's a number of people who assume that she does know and just doesn't say anything, and I think both are safe bets," Berlanti says. "We haven't firmed up if and when we clarify that point."

Supergirl airs Mondays at 8 p.m. on CBS.