Also in the upcoming episodes, we can expect the location of Mon-El's pod to be revealed, as he was forced to leave Earth in the Season 2 finale. As one of the few Kryptonians left in the galaxy, Kara knows that she's becoming something of a beacon for conflicts from beyond the stars and is now considering giving up her human persona in order to live and fight as Supergirl 24/7.
Taking that into account, distancing herself from her Kara Danvers identity (for the time being, at least) makes a bit of sense when you consider that someone like her feels like they have two separate selves, those being their Kryptonian and Earthling sides. Rather, Lima is expected to pop up as a recurring character in the third season, though it's still unknown how large her presence will be.
Luckily, the flawless person to make Kara see what a mistake this life approach will be is going to be in the season 3 premiere.
In some good news from the trailer, it looks like Maggie and Alex are happy together.
The heroine's journey picks up not long after the point where Season 2 left off, with Kara having defeated Queen Rhea and her Daxamite army.More news: What Trump's team is saying on pardons
In addition to the news of Flockhart's return, the Supergirl panel revealed some new faces that will be dropping by National City.
Grobglas will appear as DC villainess Psi, a formidable opponent with psychic powers. The trailer offered brief glimpses at a couple previously announced new cast members, including Odette Annable (Reign) and Erica Durance as the new Alura.
Annable, meanwhile, will play Season 3 big bad, Reign.
Adrian Pasdar will play the role of Morgan Edge in Season 3 of "Supergirl". Grobglas now portrays Petra Solano on CW's "Jane the Virgin". Actor Carl Lumbly will be playing J'onzz's father, M'yrnn J'onzz, this season. Additionally, Tremblay plays Ruby, a National City superfan of Supergirl who ends up in danger.
"Supergirl" Season 3 will premiere on Monday, Oct. 9 at 8 p.m. EDT on The CW.