Supergirl debuted on CBS in fall of 2015, but the show's next season will air on The CW instead. That change in home for Kara Zor-El/Danvers (Melissa Benoist) and her friends in Supergirl season 2 makes sense for a handful of reasons. After all, Ali Adler (Chuck, The New Normal) co-created the series with Greg Berlanti and Andrew Kreisberg: two of the architects of The CW's DC television universe, including Arrow, The Flash and DC's Legends of Tomorrow. Now that Supergirl is set up at The CW, it means that Kara, Barry Allen (Grant Gustin), Oliver Queen (Stephen Amell) and more can - and will - unite against new threats much more easily, too.
Kara and Barry Allen did, in fact, team up once already (during the episode "Worlds Finest"), but things will change on Supergirl season 2 so that Kara feels more like a direct part of The CW's superhero lineup and not just a character who exists somewhere out there in The Flash's multiverse. Newly-released official key art for Supergirl season 2 from The CW (in the shape of an official poster) serves to drive home the idea that Kara is truly one of the network's heroes now.
Supergirl season 2 has been filming for a while now, as evidenced by the plethora of set photos that have leaked online this past month, featuring one of season 2's key additions: Kara's famous cousin Superman, as played by Tyler Hoechlin (of Teen Wolf and Everybody Wants Some!! fame). The new season of Supergirl premieres is less than six weeks away at the time of writing this, so an official season 2 trailer ought to be arriving pretty soon. In the meantime, we can offer this poster, to help fill the Kara-sized hole in your life:
It should once again be emphasized that Supergirl's move from CBS to The CW is a significant one. Kreisberg has already teased that Supergirl season 2 will be "more comic book-y" than season 1, in the sense that the show will now feel like it's part of a larger universe in the way that comic books so often do. This should only further assist the show's producers in their efforts to improve on their work during Supergirl season 1; which, as Kreisberg has admitted and we have argued in the past, didn't fully live up to its potential but turned out well enough to justify making another (and an improved) season of the show.
Supergirl also feels more at home, both at The CW and as a more connected part of its Arrowverse: a place that will allow Supergirl to continue on being the playful and optimistic DC TV series that it was in season 1, just better. With a musical crossover with The Flash and an episode directed by Kevin Smith now officially part of the plans for season 2, Supergirl is already on its way to becoming a more consistently good and fun piece of superhero TV programming in the future (even if, sadly, we'll be getting less of Calista Flockhart's scene-stealing Cat Grant as part of the package).
The Flash season 3 will premiere Tuesday October 4th at 8pm on The CW, Arrow season 5 will premiere in the same timeslot on Wednesday October 5th, Supergirl season 2 on Monday October 10th, and Legends of Tomorrow season 2 on Thursday October 13th.
Source: The CW