Rumors about Supergirl joining the The Flash/Arrow-verse have been floating around since the show began, and now we are only a month away from finding out if it will ever actually happen.
The possibility has always made a lot of sense. The Flash, Arrow, and the upcoming Legends of Tomorrow are all deeply interconnected, with characters constantly crossing over and mentioning the other shows. It's one of the fans' favorite things about the hit shows; these are building up a completely connected and intricate DC universe that mirrors the comic books beautifully. Bringing in another small-screen DC character would fit in nicely, and not just on a creative level.
In practical terms, although the two shows are on different networks (CBS and the CW, respectively), CBS co-owns the CW, effectively removing that barrier. The Arrowverse has also shown itself to be keen on bringing existing live-action characters into the series, including Matt Ryan's Constantine.
Fans hoping for a crossover have had their hopes alternately raised and sunk by executive producer Greg Berlanti. While he has made it clear that he likes the idea of a crossover, and only last month Berlanti spoke about the possible legal issues of bringing Supergirl into the Arrowverse.
Now, in an interview with Entertainment Weekly, Berlanti has talked yet again about the possibility of a crossover.
I would love it, a lot of things would have to go right and people would have to say ‘Yes'. It would have to figured out very soon. It would all have to be figured out in the next month or so. As it remains right now we’ve talked internally about how cool it would be, but we haven’t had official conversations. [The CW chief Mark Pedowitz] is supportive.
It's obvious that everyone involved is enthusiastic about the possibility on an artistic level, and Berlanti has made no secret of how enthusiastic he would be about the possibility of a crossover.
The most exciting thing about this is that it gives us a deadline: either they will crossover or they won't, but either way, we should find out in about a months time (maybe sooner!)
Presumably, this deadline is connected to writing schedules. The longer Supergirl continues, the harder it will be to convincingly add the Flarrowverse to the show. If they want to connect the series, it will have to be soon, otherwise viewers will be left wondering why it took so long for the characters to meet. Superpowers aside, all three of the existing shows ensure that their characters and motivations are believable, and ignoring another superhero for months (or longer) before making contact just isn't that plausible.
Another reason to set a deadline may be connected to the news this week that Laura Vandervoort will be joining Supergirl as Indigo, a robotic woman with clear links to STAR Labs. In the comics, Indigo is reprogrammed by STAR Labs after her initial rampage. If Supergirl does crossover with The Flash, this seems a perfect opportunity that fits with the existing plans for Supergirl storylines.
Finally, the fact that Berlanti is setting a rough deadline for this decision suggests that even though they haven't had official conversations yet, that's about to get started.
As Berlanti has been very vocal about a crossover in the past, we are sure to hear the decision as soon as it is made, so mark your calendars! By mid-February, we should know if Kara and Barry are going to hang out in future, or if Supergirl will remain its own, separate, universe.
'Supergirl' returns January 18th on CBS
'The Flash' Season 2 returns Jan 19th on The CW